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  <xs:element id="mir_ConvertibleSeniorNotesDue2030And2031NotesMember" abstract="true" name="ConvertibleSeniorNotesDue2030And2031NotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_LesseeOperatingLeaseLiabilityToBePaidThereafter" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_UnrecordedUnconditionalPurchaseObligationToBePaidThereafter" abstract="false" name="UnrecordedUnconditionalPurchaseObligationToBePaidThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_LossContingencyDamagesSoughtSubjectToDailyPenaltyAccrual" abstract="false" name="LossContingencyDamagesSoughtSubjectToDailyPenaltyAccrual" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_LossContingencyDamagesSoughtContractualCapValue" abstract="false" name="LossContingencyDamagesSoughtContractualCapValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_SupplementalDisclosuresToConsolidatedStatementsOfCashFlowsAbstract" abstract="true" name="SupplementalDisclosuresToConsolidatedStatementsOfCashFlowsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="mir_AcquisitionPurchasesInAccruedExpenseAndOtherLiabilities" abstract="false" name="AcquisitionPurchasesInAccruedExpenseAndOtherLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_ChangeInPropertyPlantAndEquipmentPurchasesInAccountsPayable" abstract="false" name="ChangeInPropertyPlantAndEquipmentPurchasesInAccountsPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_A2021OmnibusIncentivePlanMember" abstract="true" name="A2021OmnibusIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_PerformancePeriodAxis" abstract="true" name="PerformancePeriodAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="mir_PerformancePeriodDomain" abstract="true" name="PerformancePeriodDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_ThirdAnniversaryMember" abstract="true" name="ThirdAnniversaryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_FourAnniversaryMember" abstract="true" name="FourAnniversaryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_CommonStockOutstandingOwnershipPercentage" abstract="false" name="CommonStockOutstandingOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="mir_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformancePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mir_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsGrantsInPeriodGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsGrantsInPeriodGrantDateFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_AdjustedIncomeLossFromOperations" abstract="false" name="AdjustedIncomeLossFromOperations" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_SegmentIncomeFromOperations" abstract="false" name="SegmentIncomeFromOperations" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_OtherIncomeLoss" abstract="false" name="OtherIncomeLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_NuclearPowerMember" abstract="true" name="NuclearPowerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_LabsAndResearchMember" abstract="true" name="LabsAndResearchMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_OtherResearchMember" abstract="true" name="OtherResearchMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_CancerCareMember" abstract="true" name="CancerCareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_OtherCareMember" abstract="true" name="OtherCareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_DiscretionaryRetirementPlanAssetsFairValueDisclosure" abstract="false" name="DiscretionaryRetirementPlanAssetsFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_DiscretionaryRetirementPlanLiabilitiesFairValueDisclosure" abstract="false" name="DiscretionaryRetirementPlanLiabilitiesFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="mir_DerivativeCrossCurrencyDuration" abstract="false" name="DerivativeCrossCurrencyDuration" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mir_DerivativeMaximumExposureHedgingDuration" abstract="false" name="DerivativeMaximumExposureHedgingDuration" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mir_CommonStockNumberOfVotesPerCommonShare" abstract="false" name="CommonStockNumberOfVotesPerCommonShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="mir_CommonStockConvertibleConversionRatio" abstract="false" name="CommonStockConvertibleConversionRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="mir_IntermediatecoClassBCommonStockMember" abstract="true" name="IntermediatecoClassBCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_IntermediateCoClassBCommonStockMember" abstract="true" name="IntermediateCoClassBCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_IntermediateCoMember" abstract="true" name="IntermediateCoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="mir_ClassOfWarrantOrRightRedemptionThresholdConsecutiveTradingPeriod" abstract="false" name="ClassOfWarrantOrRightRedemptionThresholdConsecutiveTradingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="mir_BusinessAcquisitionPercentageOfNonVotingInterestsNotAttributablePortion" abstract="false" name="BusinessAcquisitionPercentageOfNonVotingInterestsNotAttributablePortion" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
