﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2023v5.1">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2024-11-11T02:19:45-00:00</ReturnTs>
    <TaxPeriodEndDt>2023-12-31</TaxPeriodEndDt>
    <PreparerFirmGrp>
      <PreparerFirmEIN>541739963</PreparerFirmEIN>
      <PreparerFirmName>
        <BusinessNameLine1Txt>Robert E Clayton CPA PC</BusinessNameLine1Txt>
      </PreparerFirmName>
      <PreparerUSAddress>
        <AddressLine1Txt>111 Harold Court</AddressLine1Txt>
        <CityNm>Winchester</CityNm>
        <StateAbbreviationCd>VA</StateAbbreviationCd>
        <ZIPCd>22602</ZIPCd>
      </PreparerUSAddress>
    </PreparerFirmGrp>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2023-01-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>562353086</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>International Radiation Protection Association</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>INTE</BusinessNameControlTxt>
      <USAddress>
        <AddressLine1Txt>950 Herndon Parkway STE 450</AddressLine1Txt>
        <CityNm>Herndon</CityNm>
        <StateAbbreviationCd>VA</StateAbbreviationCd>
        <ZIPCd>20170</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Sigurdur Magnusson</PersonNm>
      <PersonTitleTxt>Treasurer</PersonTitleTxt>
      <SignatureDt>2024-11-11</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <PreparerPersonGrp>
      <PreparerPersonNm>Robert E Clayton</PreparerPersonNm>
      <PTIN>P00527390</PTIN>
      <PhoneNum>5406354848</PhoneNum>
      <PreparationDt>2024-11-11</PreparationDt>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <TaxYr>2023</TaxYr>
    <BuildTS>2024-10-15 13:58:12Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="3">
    <IRS990EZ documentId="990EZ" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <AddressChangeInd>X</AddressChangeInd>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <WebsiteAddressTxt>www.irpa.net</WebsiteAddressTxt>
      <Organization501cInd organization501cTypeTxt="6">X</Organization501cInd>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>95939</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>95927</ContributionsGiftsGrantsEtcAmt>
      <InvestmentIncomeAmt>12</InvestmentIncomeAmt>
      <TotalRevenueAmt>95939</TotalRevenueAmt>
      <FeesAndOtherPymtToIndCntrctAmt>248</FeesAndOtherPymtToIndCntrctAmt>
      <OtherExpensesTotalAmt>64745</OtherExpensesTotalAmt>
      <TotalExpensesAmt>64993</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>30946</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>296304</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>327250</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>296405</BOYAmt>
        <EOYAmt>327350</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <Form990TotalAssetsGrp>
        <BOYAmt>296405</BOYAmt>
        <EOYAmt>327350</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <BOYAmt>101</BOYAmt>
        <EOYAmt>100</EOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>296304</BOYAmt>
        <EOYAmt>327250</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <PrimaryExemptPurposeTxt>Provide a medium whereby those engaged in radiation protection activities in all countries may communicate more readily with each other and through this process advance protection of man and his environment from the hazards caused by radiation, and thereby to facilitate the safe use of medical, scientific, and industrial radiological practices for the benefit of mankind.</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Provide a medium whereby those engaged in radiation protection activities in all countries may communicate more readily with each other and through this process advance radiation protection in many parts of the world.</DescriptionProgramSrvcAccomTxt>
      </ProgramSrvcAccomplishmentGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Christopher Clement</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Ana-Maria Bomben</PersonNm>
        <TitleTxt>Vice President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Bernard le Guen</PersonNm>
        <TitleTxt>Executive Officer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Dave Niven</PersonNm>
        <TitleTxt>Communications Officer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Sigurdur Magnusson</PersonNm>
        <TitleTxt>Financial Officer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>004.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Joseph Amoako</PersonNm>
        <TitleTxt>Council Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Hielke Freerk Boersma</PersonNm>
        <TitleTxt>Council Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Claire-Louise Chapple</PersonNm>
        <TitleTxt>Council Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Cameron Jeffries</PersonNm>
        <TitleTxt>Council Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Kevin Nelson</PersonNm>
        <TitleTxt>Council Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Michiya Sasaki</PersonNm>
        <TitleTxt>Council Member</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>001.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <BooksInCareOfDetail>
        <PersonNm>Robert E Clayton CPA</PersonNm>
        <USAddress>
          <AddressLine1Txt>111 Harold Court</AddressLine1Txt>
          <CityNm>Winchester</CityNm>
          <StateAbbreviationCd>VA</StateAbbreviationCd>
          <ZIPCd>22602</ZIPCd>
        </USAddress>
        <PhoneNum>5406354848</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>false</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleB documentId="990B" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleO documentId="990O" softwareId="23017659" softwareVersionNum="23.1.0.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Travel 42,401</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Conferences, conventions, and meetings 7,419</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Congress Support 12,500</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Bank Charges 610</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Website 1,815</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26, Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Short-term loan Beginning of year 100, End of year 100</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26, Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Rounding Beginning of year 1, End of year 0</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>