<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<!-- Compliance Xpressware Instance Document http://www.compliancexpressware.com/  -->
<!-- Version: 1.0.0 --><!-- Creation date:08:57:18 GMT-0700 -->
<!-- Copyright (c) Compliance Xpressware, LLP. All Rights Reserved. -->
<xsd:schema targetNamespace="http://www.ltbridge.com/20151231" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ltbr="http://www.ltbridge.com/20151231" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:us-types="http://fasb.org/us-types/2015-01-31">
  <xsd:annotation>
    <xsd:appinfo>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DocumentAndEntityInformation" id="role_DocumentAndEntityInformation">
        <link:definition>101 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/BalanceSheet" id="role_BalanceSheet">
        <link:definition>102 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/BalanceSheetParenthetical" id="role_BalanceSheetParenthetical">
        <link:definition>103 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/IncomeStatement" id="role_IncomeStatement">
        <link:definition>104 - Statement - Consolidated Statements of Operations</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/CashFlows" id="role_CashFlows">
        <link:definition>105 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/StockholdersEquity" id="role_StockholdersEquity">
        <link:definition>106 - Statement - Consolidated Statement of Changes in Stockholders Equity</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" id="role_NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock">
        <link:definition>107 - Disclosure - Basis of Presentation, Summary of Significant Accounting Policies and Nature of Operations</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock" id="role_NotesToFinancialStatementsEarningsPerShareTextBlock">
        <link:definition>108 - Disclosure - Net Loss Per Share</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsOtherAssetsDisclosureTextBlock" id="role_NotesToFinancialStatementsOtherAssetsDisclosureTextBlock">
        <link:definition>109 - Disclosure - Accounts Receivable -Project Revenue and Reimbursable Project Costs</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsPrepaidExpensesOtherCurrentAssetsTextBlock" id="role_NotesToFinancialStatementsPrepaidExpensesOtherCurrentAssetsTextBlock">
        <link:definition>110 - Disclosure - Prepaid Expenses &amp; Other Current Assets</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsIntangibleAssetsDisclosureTextBlock" id="role_NotesToFinancialStatementsIntangibleAssetsDisclosureTextBlock">
        <link:definition>111 - Disclosure - Patents</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" id="role_NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlock">
        <link:definition>112 - Disclosure - Accounts Payable and Accrued Liabilities</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock" id="role_NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock">
        <link:definition>113 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsResearchDevelopmentAndComputerSoftwareDisclosureTextBlock" id="role_NotesToFinancialStatementsResearchDevelopmentAndComputerSoftwareDisclosureTextBlock">
        <link:definition>114 - Disclosure - Research and Development Costs</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock" id="role_NotesToFinancialStatementsIncomeTaxDisclosureTextBlock">
        <link:definition>115 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsDerivativesAndFairValueTextBlock" id="role_NotesToFinancialStatementsDerivativesAndFairValueTextBlock">
        <link:definition>116 - Disclosure - Warrant Liability</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock" id="role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock">
        <link:definition>117 - Disclosure - Stockholders' Equity</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock" id="role_NotesToFinancialStatementsSegmentReportingDisclosureTextBlock">
        <link:definition>118 - Disclosure - Business Segment Results</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock" id="role_NotesToFinancialStatementsFairValueDisclosuresTextBlock">
        <link:definition>119 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock" id="role_NotesToFinancialStatementsSubsequentEventsTextBlock">
        <link:definition>120 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies" id="role_NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies">
        <link:definition>121 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables" id="role_NotesToFinancialStatementsEarningsPerShareTextBlockTables">
        <link:definition>122 - Disclosure - Net Loss Per Share (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlockTables" id="role_NotesToFinancialStatementsAccountsPayableAndAccruedLiabilitiesDisclosureTextBlockTables">
        <link:definition>123 - Disclosure - Accounts Payable and Accrued Liabilities (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables" id="role_NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables">
        <link:definition>124 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables" id="role_NotesToFinancialStatementsIncomeTaxDisclosureTextBlockTables">
        <link:definition>125 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsDerivativesAndFairValueTextBlockTables" id="role_NotesToFinancialStatementsDerivativesAndFairValueTextBlockTables">
        <link:definition>126 - Disclosure - Warrant Liability (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables" id="role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables">
        <link:definition>127 - Disclosure - Stockholders' Equity (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables" id="role_NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables">
        <link:definition>128 - Disclosure - Business Segment Results (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables" id="role_NotesToFinancialStatementsFairValueDisclosuresTextBlockTables">
        <link:definition>129 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockDetails" id="role_DisclosureOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockDetails">
        <link:definition>130 - Disclosure - Basis of Presentation, Summary of Significant Accounting Policies and Nature of Operations (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureOtherAssetsDisclosureTextBlockDetails" id="role_DisclosureOtherAssetsDisclosureTextBlockDetails">
        <link:definition>131 - Disclosure - Accounts Receivable -Project Revenue and Reimbursable Project Costs (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosurePrepaidExpensesOtherCurrentAssetsTextBlockDetails" id="role_DisclosurePrepaidExpensesOtherCurrentAssetsTextBlockDetails">
        <link:definition>132 - Disclosure - Prepaid Expenses &amp; Other Current Assets (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureIntangibleAssetsDisclosureTextBlockDetails" id="role_DisclosureIntangibleAssetsDisclosureTextBlockDetails">
        <link:definition>133 - Disclosure - Patents (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureCommitmentsAndContingenciesDisclosureTextBlockDetails" id="role_DisclosureCommitmentsAndContingenciesDisclosureTextBlockDetails">
        <link:definition>134 - Disclosure - Commitments and Contingencies (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureResearchDevelopmentAndComputerSoftwareDisclosureTextBlockDetails" id="role_DisclosureResearchDevelopmentAndComputerSoftwareDisclosureTextBlockDetails">
        <link:definition>135 - Disclosure - Research and Development Costs (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureIncomeTaxDisclosureTextBlockDetails" id="role_DisclosureIncomeTaxDisclosureTextBlockDetails">
        <link:definition>136 - Disclosure - Income Taxes (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureDerivativesAndFairValueTextBlockDetails" id="role_DisclosureDerivativesAndFairValueTextBlockDetails">
        <link:definition>137 - Disclosure - Warrant Liability (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureStockholdersEquityNoteDisclosureTextBlockDetails" id="role_DisclosureStockholdersEquityNoteDisclosureTextBlockDetails">
        <link:definition>138 - Disclosure - Stockholders' Equity (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureSubsequentEventsTextBlockDetails" id="role_DisclosureSubsequentEventsTextBlockDetails">
        <link:definition>139 - Disclosure - Subsequent Events (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfEarningsPerShareBasicAndDilutedTableTextBlockDetails" id="role_DisclosureScheduleOfEarningsPerShareBasicAndDilutedTableTextBlockDetails">
        <link:definition>140 - Disclosure - Schedule of Earnings Per Share, Basic and Diluted (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlockDetails" id="role_DisclosureScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlockDetails">
        <link:definition>141 - Disclosure - Schedule of Accounts Payable and Accrued Liabilities (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlockDetails" id="role_DisclosureScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlockDetails">
        <link:definition>142 - Disclosure - Schedule of Future Minimum Rental Payments for Operating Leases (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlockDetails" id="role_DisclosureScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlockDetails">
        <link:definition>143 - Disclosure - Schedule of Deferred Tax Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlockDetails" id="role_DisclosureScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlockDetails">
        <link:definition>144 - Disclosure - Schedule of Reconcilation of Income Taxes (Benefit) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfDerivativeAssetsAtFairValueTableTextBlockDetails" id="role_DisclosureScheduleOfDerivativeAssetsAtFairValueTableTextBlockDetails">
        <link:definition>145 - Disclosure - Schedule of Aggregate Fair Values, Warrants (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlockDetails" id="role_DisclosureScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlockDetails">
        <link:definition>146 - Disclosure - Schedule of Warrants Outstanding (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlockDetails" id="role_DisclosureScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlockDetails">
        <link:definition>147 - Disclosure - Schedule of Share-based Compensation, Stock Options, Activity (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfNonvestedSharesActivityTableTextBlockDetails" id="role_DisclosureScheduleOfNonvestedSharesActivityTableTextBlockDetails">
        <link:definition>148 - Disclosure - Schedule of Non-Vested Shares, Activity (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureDisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlockDetails" id="role_DisclosureDisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlockDetails">
        <link:definition>149 - Statement - Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlockDetails" id="role_DisclosureScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlockDetails">
        <link:definition>150 - Disclosure - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureScheduleOfSegmentReportingInformationBySegmentTextBlockDetails" id="role_DisclosureScheduleOfSegmentReportingInformationBySegmentTextBlockDetails">
        <link:definition>151 - Statement - Schedule of Segment Reporting Information, by Segment (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureFairValueByBalanceSheetGroupingTextBlockDetails" id="role_DisclosureFairValueByBalanceSheetGroupingTextBlockDetails">
        <link:definition>152 - Disclosure - Schedule of Fair Value, Financial Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.ltbridge.com/taxonomy/role/DisclosureFairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlockDetails" id="role_DisclosureFairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlockDetails">
        <link:definition>153 - Disclosure - Schedule of Reconciliation of Warrant Liability (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:href="ltbr-20151231_cal.xml" xlink:title="Calculation Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:href="ltbr-20151231_def.xml" xlink:title="Definition Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:href="ltbr-20151231_lab.xml" xlink:title="Label Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:href="ltbr-20151231_pre.xml" xlink:title="Presentation Links, all"/>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <xsd:import namespace="http://fasb.org/us-gaap/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd"/>
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd"/>
  <xsd:import namespace="http://fasb.org/us-types/2015-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2015/elts/us-types-2015-01-31.xsd"/>
  <xsd:element name="DocumentAndEntityInformationAbstract" id="ltbr_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="NotesToFinancialStatementsAbstract" id="ltbr_NotesToFinancialStatementsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DeferredLeaseAbandonmentLiability" id="ltbr_DeferredLeaseAbandonmentLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="ClassOfWarrantOrRightsRevaluation" id="ltbr_ClassOfWarrantOrRightsRevaluation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="CashPaidDuringThePeriodAbstract" id="ltbr_CashPaidDuringThePeriodAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SharesIssuedForStockOfferingCosts" id="ltbr_SharesIssuedForStockOfferingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <xsd:element name="WarrantLiabilityFairValueOfWarrantsExercised" id="ltbr_WarrantLiabilityFairValueOfWarrantsExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <xsd:element name="StockCommitedFutureIssuanceMember" id="ltbr_StockCommitedFutureIssuanceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SharesIssuedRegisteredDirectOfferingNetOfOfferingCosts" id="ltbr_SharesIssuedRegisteredDirectOfferingNetOfOfferingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="SharesIssuedRegisteredDirectOfferingNetOfOfferingCostsShares" id="ltbr_SharesIssuedRegisteredDirectOfferingNetOfOfferingCostsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="WarrantsExercised" id="ltbr_WarrantsExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="WarrantsExercisedShares" id="ltbr_WarrantsExercisedShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ApproximationsMember" id="ltbr_ApproximationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="PrepaidExpensesOtherCurrentAssetsTextBlock" id="ltbr_PrepaidExpensesOtherCurrentAssetsTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DeferredTaxAssetAmountMember" id="ltbr_DeferredTaxAssetAmountMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="BasisOfConsolidationPolicyTextBlock" id="ltbr_BasisOfConsolidationPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SignificantEstimatesPolicyTextBlock" id="ltbr_SignificantEstimatesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TechnologyBusinessSegmentPolicyTextBlock" id="ltbr_TechnologyBusinessSegmentPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ConsultingBusinessSegmentPolicyTextBlock" id="ltbr_ConsultingBusinessSegmentPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ScheduleOfNonvestedSharesActivityTableTextBlock" id="ltbr_ScheduleOfNonvestedSharesActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DoublelineTotalReturnBondFundMember" id="ltbr_DoublelineTotalReturnBondFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="VanguardWellesleyIncomeFundMember" id="ltbr_VanguardWellesleyIncomeFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="VanguardHighYieldCorpInvestorFundMember" id="ltbr_VanguardHighYieldCorpInvestorFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="VanguardGnmaInvestorFundMember" id="ltbr_VanguardGnmaInvestorFundMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="VanguardShortTermInvestmentGradeInvestorMember" id="ltbr_VanguardShortTermInvestmentGradeInvestorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RemainderMember" id="ltbr_RemainderMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="AdjustmentsMember" id="ltbr_AdjustmentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CorporateCreditCardAndDailyAchTransactionLimitMember" id="ltbr_CorporateCreditCardAndDailyAchTransactionLimitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="EnecAndFanrProjectsMember" id="ltbr_EnecAndFanrProjectsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="FanrMember" id="ltbr_FanrMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="LloydRegisterContractMember" id="ltbr_LloydRegisterContractMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ENECMember" id="ltbr_ENECMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="WorkingCapital" id="ltbr_WorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ValueOfNuclearScienceAndTechnologyCentre" id="ltbr_ValueOfNuclearScienceAndTechnologyCentre" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ExtentionOfFuelCycleLength" id="ltbr_ExtentionOfFuelCycleLength" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="PowerOutputIncreaseBasedOnFuturePotentialReveunes" id="ltbr_PowerOutputIncreaseBasedOnFuturePotentialReveunes" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="OperatingCycleLength" id="ltbr_OperatingCycleLength" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MaximumIncreaseInPowerOutputBasedOnFutureRevenue" id="ltbr_MaximumIncreaseInPowerOutputBasedOnFutureRevenue" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MetallicFuelPowerUpratePercentage" id="ltbr_MetallicFuelPowerUpratePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="OperatingCycleLengthWestinghouseType" id="ltbr_OperatingCycleLengthWestinghouseType" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="LetterOfCredit" id="ltbr_LetterOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <xsd:element name="UnrealizedGainLossFromFinancialInstitutions" id="ltbr_UnrealizedGainLossFromFinancialInstitutions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <xsd:element name="ValuationAllowance" id="ltbr_ValuationAllowance" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="MoreLikelyThanNotThreshold" id="ltbr_MoreLikelyThanNotThreshold" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="PercentageOfCostOfConsultingFromOneFirm" id="ltbr_PercentageOfCostOfConsultingFromOneFirm" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="PortionOfAccountsReceivable" id="ltbr_PortionOfAccountsReceivable" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="MajorCustomerRevenuePercentage" id="ltbr_MajorCustomerRevenuePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="TravelAndOtherReimbursableExpensesIncludedInAccountsReceivable" id="ltbr_TravelAndOtherReimbursableExpensesIncludedInAccountsReceivable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <xsd:element name="LeaseAgreementAxis" id="ltbr_LeaseAgreementAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="LeaseAgreementDomain" id="ltbr_LeaseAgreementDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MoscowOfficeMember" id="ltbr_MoscowOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="McleanVirginiaOfficeMember" id="ltbr_McleanVirginiaOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestonVirginiaOfficeMember" id="ltbr_RestonVirginiaOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="VirginiaOfficeMember" id="ltbr_VirginiaOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SubleaseAgreementMember" id="ltbr_SubleaseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CapitalizedCostsForPatents" id="ltbr_CapitalizedCostsForPatents" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="FairfaxCountyComplaintOneMember" id="ltbr_FairfaxCountyComplaintOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="FairfaxCountyComplaintTwoMember" id="ltbr_FairfaxCountyComplaintTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="OperatingLeaseTerm" id="ltbr_OperatingLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="PresentValueOfTheNegativeCashFlowsFromSuLeaseAgreement" id="ltbr_PresentValueOfTheNegativeCashFlowsFromSuLeaseAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="DeferredLeaseAbandonmentLiabilityShortTerm" id="ltbr_DeferredLeaseAbandonmentLiabilityShortTerm" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="TaskOrderOneWithTexasAmUniversityMember" id="ltbr_TaskOrderOneWithTexasAmUniversityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ResearchAndDevelopmentCosts" id="ltbr_ResearchAndDevelopmentCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <xsd:element name="ConsultingAgreementMontlyPayments" id="ltbr_ConsultingAgreementMontlyPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="AmountDueUponExecution" id="ltbr_AmountDueUponExecution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="IfeUmbrellaServiceAgreement" id="ltbr_IfeUmbrellaServiceAgreement" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MaximumRestrictedSharesGrantedMember" id="ltbr_MaximumRestrictedSharesGrantedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MaximumNumberOfSharesInRespectToStockOptionsMember" id="ltbr_MaximumNumberOfSharesInRespectToStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MaximumRestrictedSharesGrantedToOnePersonMember" id="ltbr_MaximumRestrictedSharesGrantedToOnePersonMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="StockOptionsVestedMember" id="ltbr_StockOptionsVestedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="StockbasedCompensationMember" id="ltbr_StockbasedCompensationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="StockAndStockEquivalentsMember" id="ltbr_StockAndStockEquivalentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="WarrantAmountMember" id="ltbr_WarrantAmountMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TwoZeroZeroSixStockPlanMember" id="ltbr_TwoZeroZeroSixStockPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TwoZeroOneFiveEquityIncentivePlanMember" id="ltbr_TwoZeroOneFiveEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="EquityTransactionAxis" id="ltbr_EquityTransactionAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="EquityTransactionDomain" id="ltbr_EquityTransactionDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IssuanceOfTwoFiveFiveTwoZeroTwoNonqualifiedOneZeroYearOptionsMember" id="ltbr_IssuanceOfTwoFiveFiveTwoZeroTwoNonqualifiedOneZeroYearOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IssuanceOfFourFiveOneSevenTwoFiveNineNonqualifiedFiveOneZeroYearOptionsMember" id="ltbr_IssuanceOfFourFiveOneSevenTwoFiveNineNonqualifiedFiveOneZeroYearOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IssuanceOfFourSixFourFourFourEightNonqualifiedThreeOneZeroYearOptionsMember" id="ltbr_IssuanceOfFourSixFourFourFourEightNonqualifiedThreeOneZeroYearOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="UnregisteredSecuritiesMember" id="ltbr_UnregisteredSecuritiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RegisteredDirectOfferingAndOutstandingWarrantsMember" id="ltbr_RegisteredDirectOfferingAndOutstandingWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="MayFiveTwoZeroOneFourStockOptionsGrantedMember" id="ltbr_MayFiveTwoZeroOneFourStockOptionsGrantedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="NovemberTwoZeroOneFourOfferingMember" id="ltbr_NovemberTwoZeroOneFourOfferingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="NovemberOneTwoTwoZeroOneFourOfferingMember" id="ltbr_NovemberOneTwoTwoZeroOneFourOfferingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IssuedToInvestorsOnJulyTwoEightTwoZeroOneZeroMember" id="ltbr_IssuedToInvestorsOnJulyTwoEightTwoZeroOneZeroMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IssuedToInvestorsOnOctoberTwoFiveTwoZeroOneThreeMember" id="ltbr_IssuedToInvestorsOnOctoberTwoFiveTwoZeroOneThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="IssuedToInvestorsOnNovemberOneSevenTwoZeroOneFourMember" id="ltbr_IssuedToInvestorsOnNovemberOneSevenTwoZeroOneFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TwoZeroOneFiveShorttermNonqualifiedOptionGrantsMember" id="ltbr_TwoZeroOneFiveShorttermNonqualifiedOptionGrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TwoZeroOneFiveLongtermIncentiveOptionGrantsMember" id="ltbr_TwoZeroOneFiveLongtermIncentiveOptionGrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="AtmOfferingMember" id="ltbr_AtmOfferingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShorttermNonqualifiedStockOptionsMember" id="ltbr_ShorttermNonqualifiedStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="LongtermNonqualifiedStockOptionsMember" id="ltbr_LongtermNonqualifiedStockOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TwoZeroOneFiveStockEquityPlanMember" id="ltbr_TwoZeroOneFiveStockEquityPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="EquityPurchaseAgreementMember" id="ltbr_EquityPurchaseAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="EmployeesAndConsultantsMember" id="ltbr_EmployeesAndConsultantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DirectorsMember" id="ltbr_DirectorsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="AspireCapitalMember" id="ltbr_AspireCapitalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CommonStockReservedForIssuance" id="ltbr_CommonStockReservedForIssuance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="IssuedButUnvestedRestrictedStock" id="ltbr_IssuedButUnvestedRestrictedStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="TotalStockAndStockEquivalentsOutstanding" id="ltbr_TotalStockAndStockEquivalentsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="NonQualifiedStockOptions" id="ltbr_NonQualifiedStockOptions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="UnrecognizedCompensationCosts" id="ltbr_UnrecognizedCompensationCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <xsd:element name="ExpectedCompensationCost" id="ltbr_ExpectedCompensationCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <xsd:element name="WeightedAverageRecognitionPeriod" id="ltbr_WeightedAverageRecognitionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestrictedStockGrantsEstimatedForfeitureAmount" id="ltbr_RestrictedStockGrantsEstimatedForfeitureAmount" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="TotalFundraisingLimit" id="ltbr_TotalFundraisingLimit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <xsd:element name="EquityIssuanceAmountPerShare" id="ltbr_EquityIssuanceAmountPerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CommonStockAndWarrantsSold" id="ltbr_CommonStockAndWarrantsSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <xsd:element name="NasdaqTwoZeroRule" id="ltbr_NasdaqTwoZeroRule" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="PercentageOfTheFairMarketValueOfTheCommonStockForOptionExercisePrice" id="ltbr_PercentageOfTheFairMarketValueOfTheCommonStockForOptionExercisePrice" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SharesOfCommonStockToBePurchasedByFixedCombination" id="ltbr_SharesOfCommonStockToBePurchasedByFixedCombination" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="PurchasePriceOfFixedCombination" id="ltbr_PurchasePriceOfFixedCombination" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="debit"/>
  <xsd:element name="MaximumCommonStockOwnershipToBeEligibleForExerciseOfWarrants" id="ltbr_MaximumCommonStockOwnershipToBeEligibleForExerciseOfWarrants" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="NetProceedsFromTheOfferingReceivedAfterPaymentsOfFeesAndExpenses" id="ltbr_NetProceedsFromTheOfferingReceivedAfterPaymentsOfFeesAndExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="StrikePrice" id="ltbr_StrikePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompenationWeightedAverageFairValue" id="ltbr_ShareBasedCompenationWeightedAverageFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="FairMarketValueOnMeasurementDate" id="ltbr_FairMarketValueOnMeasurementDate" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="PreVestingForfeitureRate" id="ltbr_PreVestingForfeitureRate" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="SharesOfCommonStockLimitOnStockOptions" id="ltbr_SharesOfCommonStockLimitOnStockOptions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CommonStockPurchaseCommitmentAmount" id="ltbr_CommonStockPurchaseCommitmentAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="CommonStockPurchaseAmountPerBusinessDay" id="ltbr_CommonStockPurchaseAmountPerBusinessDay" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="CommonStockPurchaseAmountPerBusinessDayValue" id="ltbr_CommonStockPurchaseAmountPerBusinessDayValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="PercentageOfAggregateSharesOfTheCompanySCommonStockToBePurchased" id="ltbr_PercentageOfAggregateSharesOfTheCompanySCommonStockToBePurchased" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="PercentageOfPurchasePricePerSharePursuantToVwap" id="ltbr_PercentageOfPurchasePricePerSharePursuantToVwap" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="ExpectedPaymentsForJointEvaluationProjectPlan" id="ltbr_ExpectedPaymentsForJointEvaluationProjectPlan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="NumeratorAbstract" id="ltbr_NumeratorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="DenominatorAbstract" id="ltbr_DenominatorAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CapitalizedStartUpCosts" id="ltbr_CapitalizedStartUpCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="DeferredTaxAssetsShareBasedCompensation" id="ltbr_DeferredTaxAssetsShareBasedCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" xbrli:balance="credit"/>
  <xsd:element name="WeightedAverageExercisePricePerShareOfWarrant" id="ltbr_WeightedAverageExercisePricePerShareOfWarrant" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageFairValueStockOptionsGranted" id="ltbr_ShareBasedCompensationWeightedAverageFairValueStockOptionsGranted" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageExercisePriceStockOptionsExercised" id="ltbr_ShareBasedCompensationWeightedAverageExercisePriceStockOptionsExercised" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageFairValueStockOptionsExercised" id="ltbr_ShareBasedCompensationWeightedAverageFairValueStockOptionsExercised" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageFairValueStockOptionsForfeited" id="ltbr_ShareBasedCompensationWeightedAverageFairValueStockOptionsForfeited" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageFairValueStockOptionsExpired" id="ltbr_ShareBasedCompensationWeightedAverageFairValueStockOptionsExpired" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageFairValueEndOfYear" id="ltbr_ShareBasedCompensationWeightedAverageFairValueEndOfYear" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="ShareBasedCompensationWeightedAverageFairValueOptionsExerciseable" id="ltbr_ShareBasedCompensationWeightedAverageFairValueOptionsExerciseable" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePrice" id="ltbr_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePrice" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceGranted" id="ltbr_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceGranted" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceVested" id="ltbr_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceVested" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceForfeited" id="ltbr_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageExercisePriceForfeited" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RangeOneMember" id="ltbr_RangeOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RangeTwoMember" id="ltbr_RangeTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RangeThreeMember" id="ltbr_RangeThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RangeFourMember" id="ltbr_RangeFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RangeFiveMember" id="ltbr_RangeFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm" id="ltbr_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ConsultingMember" id="ltbr_ConsultingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TechnologyMember" id="ltbr_TechnologyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="CorporateAndEliminationsMember" id="ltbr_CorporateAndEliminationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="SegmentReportingMember" id="ltbr_SegmentReportingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
</xsd:schema>
