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<!-- Compliance Xpressware Instance Document http://www.compliancexpressware.com/  -->
<!-- Version: 1.0.0 --><!-- Creation date:14:03:59 GMT-0700 -->
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        <link:definition>111 - Disclosure - Patents and Other Assets</link:definition>
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        <link:definition>112 - Disclosure - Accounts Payable and Accrued Liabilities</link:definition>
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        <link:definition>113 - Disclosure - Income Taxes</link:definition>
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        <link:definition>114 - Disclosure - Commitments and Contingencies</link:definition>
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        <link:definition>115 - Disclosure - Research and Development Costs</link:definition>
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        <link:definition>121 - Disclosure - Accounts Payable and Accrued Liabilities (Tables)</link:definition>
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  <xsd:import namespace="http://fasb.org/us-gaap/2014-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.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/2014-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2014/elts/us-types-2014-01-31.xsd"/>
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  <xsd:element name="NotesToFinancialStatementsAbstract" id="ltbr_NotesToFinancialStatementsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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  <xsd:element name="CashPaidDuringThePeriodAbstract" id="ltbr_CashPaidDuringThePeriodAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="StockCommitedFutureIssuanceMember" id="ltbr_StockCommitedFutureIssuanceMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ProceedsFromTheSaleOfCommonStockNetOfOfferingCosts" id="ltbr_ProceedsFromTheSaleOfCommonStockNetOfOfferingCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <xsd:element name="ProceedsFromTheSaleOfCommonStockNetOfOfferingCostsShares" id="ltbr_ProceedsFromTheSaleOfCommonStockNetOfOfferingCostsShares" type="xbrli:sharesItemType" 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"/>
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  <xsd:element name="ConsultingBusinessSegmentPolicyTextBlock" id="ltbr_ConsultingBusinessSegmentPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
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  <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="CorporateCreditCardAndDailyAchTransactionLimitMember" id="ltbr_CorporateCreditCardAndDailyAchTransactionLimitMember" type="nonnum:domainItemType" 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"/>
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  <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="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="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="CapitalizedCostsForPatents" id="ltbr_CapitalizedCostsForPatents" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="credit"/>
  <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="VirginiaOfficeMember" id="ltbr_VirginiaOfficeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <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="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"/>
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  <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"/>
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  <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="EquityTransactionAxis" id="ltbr_EquityTransactionAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration"/>
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  <xsd:element name="IssuanceOfTwoFiveFiveTwoZeroTwoNonqualifiedOneZeroYearOptionsMember" id="ltbr_IssuanceOfTwoFiveFiveTwoZeroTwoNonqualifiedOneZeroYearOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
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  <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="IssuanceOfOneNineOneNineFourSevenNonqualifiedFiveOneZeroYearOptionsMember" id="ltbr_IssuanceOfOneNineOneNineFourSevenNonqualifiedFiveOneZeroYearOptionsMember" 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="IssuedButUnvestedRestrictedStock" id="ltbr_IssuedButUnvestedRestrictedStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
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  <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"/>
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  <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="CommonStockAndWarrantsSold" id="ltbr_CommonStockAndWarrantsSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" xbrli:balance="debit"/>
  <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="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="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="RangeOneMember" id="ltbr_RangeOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
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  <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="SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm" id="ltbr_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFai" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFai" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymantAwardEquityInstrumentsOtherThanOptionsVestedTotal" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymantAwardEquityInstrumentsOtherThanOptionsVestedTotal" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymantAwardEquityInstrumentsOtherThanOptions" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymantAwardEquityInstrumentsOtherThanOptions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValuePeriod" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageGrantDateFairValuePeriod" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalNonvestedNumber" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalNonvestedNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalNonvestedWeightedAverageGrantDateFairVa" id="ltbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalNonvestedWeightedAverageGrantDateFairVa" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestrictedStockUnitsScheduledToVestInTheNextYear" id="ltbr_RestrictedStockUnitsScheduledToVestInTheNextYear" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestrictedStockUnitsScheduledForVestingInTheSecondYear" id="ltbr_RestrictedStockUnitsScheduledForVestingInTheSecondYear" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestrictedStockUnitsScheduledForVestingInTheThirdYear" id="ltbr_RestrictedStockUnitsScheduledForVestingInTheThirdYear" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestrictedStockUnitsScheduledForVestingInTheFourthYear" id="ltbr_RestrictedStockUnitsScheduledForVestingInTheFourthYear" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="RestrictedStockUnitsScheduledForVestingThereafter" id="ltbr_RestrictedStockUnitsScheduledForVestingThereafter" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="TotalOutstandingRestrictedStockUnitsScheduledToVest" id="ltbr_TotalOutstandingRestrictedStockUnitsScheduledToVest" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="StockbasedCompensationAxis" id="ltbr_StockbasedCompensationAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration"/>
  <xsd:element name="StockbasedCompensationDomain" id="ltbr_StockbasedCompensationDomain" type="nonnum:domainItemType" 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>
