Designation:C1625−12StandardTestMethodforUraniumandPlutoniumConcentrationsandIsotopicAbundancesbyThermalIonizationMassSpectrometry1ThisstandardisissuedunderthefixeddesignationC1625;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthecon-centrationandisotopiccompositionofuraniumandplutoniuminsolutions.Thepurifieduraniumorplutoniumfromsamplesrangingfromnuclearmaterialstoenvironmentalorbioassaymatricesisloadedontoamassspectrometricfilament.Theisotopicratioisdeterminedbythermalionizationmassspectrometry,theconcentrationisdeterminedbyisotopedilu-tion.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Valuesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishsafetyandhealthpracticesanddeterminetheapplicabilityofregu-latorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C753SpecificationforNuclear-Grade,SinterableUraniumDioxidePowderC757SpecificationforNuclear-GradePlutoniumDioxidePowder,SinterableC776SpecificationforSinteredUraniumDioxidePelletsC833SpecificationforSintered(Uranium-Plutonium)Diox-idePelletsC859TerminologyRelatingtoNuclearMaterialsC1008SpecificationforSintered(Uranium-Plutonium)Di-oxidePellets—FastReactorFuelC1068GuideforQualificationofMeasurementMethodsbyaLaboratoryWithintheNuclearIndustryC1156GuideforEstablishingCalibrationforaMeasure-mentMethodUsedtoAnalyzeNuclearFuelCycleMate-rialsC1168PracticeforPreparationandDissolutionofPlutoniumMaterialsforAnalysisC1347PracticeforPreparationandDissolutionofUraniumMaterialsforAnalysisC1411PracticeforTheIonExchangeSeparationofUra-niumandPlutoniumPriortoIsotopicAnalysisC1415TestMethodfor238PuIsotopicAbundanceByAlphaSpectr...
