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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995486 - Disclosure - Note 6 - Patents and Other Intangible Assets (Details Textual) </link:definition> |
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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995489 - Disclosure - Note 7 - Convertible Debentures and Notes Payable (Details Textual) </link:definition> |
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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995490 - Disclosure - Note 7 - Convertible Debentures and Notes Payable - Schedule of Long-term Debt Instruments (Details) </link:definition> |
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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995492 - Disclosure - Note 7 - Convertible Debentures and Notes Payable - Schedule of Maturities of Long-term Debt (Details) </link:definition> |
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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995493 - Disclosure - Note 8 - Lease Obligations - Lease Cost (Details) </link:definition> |
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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995494 - Disclosure - Note 8 - Lease Obligations - Schedule of Future Minimum Lease Payments (Details) </link:definition> |
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| <link:definition xmlns="http://www.xbrl.org/2003/linkbase"> 995495 - Disclosure - Note 9 - Shareholders' Equity, Redeemable Convertible Preferred Stock, Options and Warrants (Details Textual) </link:definition> |
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| <xsd:element id="inis_EmploymentAgreementMinimumPricePerShare" name="EmploymentAgreementMinimumPricePerShare" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="inis_ExecutiveOfficersAndDirectorsMember" name="ExecutiveOfficersAndDirectorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_FinanceLeaseExpense" name="FinanceLeaseExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_FluorineProductsMember" name="FluorineProductsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_IncreaseDecreaseInNetIncomeLoss" name="IncreaseDecreaseInNetIncomeLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="inis_LandInLeaCountyNewMexicoMember" name="LandInLeaCountyNewMexicoMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_LesseeLiabilityToBePaidMaturityTableTextBlock" name="LesseeLiabilityToBePaidMaturityTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_LesseeOperatingLeasesAndFinanceLeasesTextBlock" name="LesseeOperatingLeasesAndFinanceLeasesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_LicenseTerm" name="LicenseTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_LongtermDebtMaturityAfterYearFour" name="LongtermDebtMaturityAfterYearFour" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="inis_MajorShareholdersMember" name="MajorShareholdersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NonqualifiedOptionsMember" name="NonqualifiedOptionsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NotesPayableForPurchaseContractOneMember" name="NotesPayableForPurchaseContractOneMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NotesPayableForPurchaseContractTwoMember" name="NotesPayableForPurchaseContractTwoMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NotesToFinancialStatementsAbstract" name="NotesToFinancialStatementsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NrcLicenseForTheDeconversionFacilityMember" name="NrcLicenseForTheDeconversionFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_NuclearMedicineProductsMember" name="NuclearMedicineProductsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_NumberOfEmployeesHired" name="NumberOfEmployeesHired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_NumberOfMajorCustomers" name="NumberOfMajorCustomers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_OneEmployeeMember" name="OneEmployeeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_OperatingLeaseRightofuseAssetPeriodicReductionIncrease" name="OperatingLeaseRightofuseAssetPeriodicReductionIncrease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/> |
| <xsd:element id="inis_OtherCommitmentsAnnualFixedPriceEscalationPercent" name="OtherCommitmentsAnnualFixedPriceEscalationPercent" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="instant"/> |
| <xsd:element id="inis_PercentOfTotalRevenues" name="PercentOfTotalRevenues" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_PreferredStockConvertibleStockPriceTrigger" name="PreferredStockConvertibleStockPriceTrigger" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" xbrli:periodType="instant"/> |
| <xsd:element id="inis_PreferredStockConvertibleThresholdTradingDays" name="PreferredStockConvertibleThresholdTradingDays" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant"/> |
| <xsd:element abstract="true" id="inis_PrepaymentForDufPlantMember" name="PrepaymentForDufPlantMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_ProductionEquipmentMember" name="ProductionEquipmentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_QualifiedOptionsMember" name="QualifiedOptionsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_RelatedPartyOneMember" name="RelatedPartyOneMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_RelatedPartyThreeMember" name="RelatedPartyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_RelatedPartyTwoMember" name="RelatedPartyTwoMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_SharebasedCompensationArrangementBySharebasedPaymentAwardPercentOfGrossPay" name="SharebasedCompensationArrangementBySharebasedPaymentAwardPercentOfGrossPay" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="instant"/> |
| <xsd:element id="inis_StockIssuedDuringPeriodSharesWarrantExercises" name="StockIssuedDuringPeriodSharesWarrantExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/> |
| <xsd:element id="inis_StockIssuedDuringPeriodValueWarrantExercises" name="StockIssuedDuringPeriodValueWarrantExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_SubscriptionAgreementsWithCertainInvestorsMember" name="SubscriptionAgreementsWithCertainInvestorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_The2006PlanMember" name="The2006PlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_The2013PromissoryNoteMember" name="The2013PromissoryNoteMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_The2015IncentivePlanMember" name="The2015IncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_The2018PromissoryNoteMember" name="The2018PromissoryNoteMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_The2019PromissoryNoteMember" name="The2019PromissoryNoteMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_The401kPlanMember" name="The401kPlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_TheranosticsProductsMember" name="TheranosticsProductsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_ThreeCustomersMember" name="ThreeCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_TwoEmployeesMember" name="TwoEmployeesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-1-description-of-business-and-significant-accounting-policies-schedule-of-common-stock-equivalents-outstanding-details" name="statement-statement-note-1-description-of-business-and-significant-accounting-policies-schedule-of-common-stock-equivalents-outstanding-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-1-description-of-business-and-significant-accounting-policies-schedule-of-weighted-average-number-of-shares-details" name="statement-statement-note-1-description-of-business-and-significant-accounting-policies-schedule-of-weighted-average-number-of-shares-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-1-description-of-business-and-significant-accounting-policies-tables" name="statement-statement-note-1-description-of-business-and-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-10-income-taxes-schedule-of-deferred-tax-assets-and-liabilities-details" name="statement-statement-note-10-income-taxes-schedule-of-deferred-tax-assets-and-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-10-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details" name="statement-statement-note-10-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-10-income-taxes-tables" name="statement-statement-note-10-income-taxes-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-12-asset-retirement-obligation-schedule-of-asset-retirement-obligation-activity-details" name="statement-statement-note-12-asset-retirement-obligation-schedule-of-asset-retirement-obligation-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-12-asset-retirement-obligation-tables" name="statement-statement-note-12-asset-retirement-obligation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-14-revenue-recognition-disaggregation-of-revenue-details" name="statement-statement-note-14-revenue-recognition-disaggregation-of-revenue-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-14-revenue-recognition-tables" name="statement-statement-note-14-revenue-recognition-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-15-segment-information-schedule-of-segment-information-by-segment-details" name="statement-statement-note-15-segment-information-schedule-of-segment-information-by-segment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-15-segment-information-tables" name="statement-statement-note-15-segment-information-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-5-property-plant-and-equipment-schedule-of-property-plant-and-equipment-details" name="statement-statement-note-5-property-plant-and-equipment-schedule-of-property-plant-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-5-property-plant-and-equipment-tables" name="statement-statement-note-5-property-plant-and-equipment-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-6-patents-and-other-intangible-assets-schedule-of-future-amortization-expense-details" name="statement-statement-note-6-patents-and-other-intangible-assets-schedule-of-future-amortization-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-6-patents-and-other-intangible-assets-schedule-of-intangible-assets-details" name="statement-statement-note-6-patents-and-other-intangible-assets-schedule-of-intangible-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-6-patents-and-other-intangible-assets-tables" name="statement-statement-note-6-patents-and-other-intangible-assets-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-7-convertible-debentures-and-notes-payable-schedule-of-longterm-debt-instruments-details" name="statement-statement-note-7-convertible-debentures-and-notes-payable-schedule-of-longterm-debt-instruments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-7-convertible-debentures-and-notes-payable-schedule-of-longterm-debt-instruments-details-parentheticals" name="statement-statement-note-7-convertible-debentures-and-notes-payable-schedule-of-longterm-debt-instruments-details-parentheticals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-7-convertible-debentures-and-notes-payable-schedule-of-maturities-of-longterm-debt-details" name="statement-statement-note-7-convertible-debentures-and-notes-payable-schedule-of-maturities-of-longterm-debt-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-7-convertible-debentures-and-notes-payable-tables" name="statement-statement-note-7-convertible-debentures-and-notes-payable-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-8-lease-obligations-lease-cost-details" name="statement-statement-note-8-lease-obligations-lease-cost-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-8-lease-obligations-schedule-of-future-minimum-lease-payments-details" name="statement-statement-note-8-lease-obligations-schedule-of-future-minimum-lease-payments-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-8-lease-obligations-tables" name="statement-statement-note-8-lease-obligations-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-option-activity-details" name="statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-restricted-stock-units-activity-details" name="statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-restricted-stock-units-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-schedule-of-warrant-activity-details" name="statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-schedule-of-warrant-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-tables" name="statement-statement-note-9-shareholders-equity-redeemable-convertible-preferred-stock-options-and-warrants-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| <xsd:element abstract="true" id="inis_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/> |
| </xsd:schema> |