Designation:C1413−18StandardTestMethodforIsotopicAnalysisofHydrolyzedUraniumHexafluorideandUranylNitrateSolutionsbyThermalIonizationMassSpectrometry1ThisstandardisissuedunderthefixeddesignationC1413;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thismethodappliestothedeterminationofisotopiccompositioninhydrolyzednucleargradeuraniumhexafluo-ride.Itcoversisotopicabundanceof235Ubetween0.1and5.0%massfraction,abundanceof234Ubetween0.0055and0.05%massfraction,andabundanceof236Ubetween0.0003and0.5%massfraction.Thistestmethodmaybeapplicabletootherisotopicabundanceprovidingthatcorrespondingstan-dardsareavailable.1.2Thistestmethodcanapplytouranylnitratesolutions.Thiscanbeachievedeitherbytransformingtheuranylnitratesolutiontoauranylfluoridesolutionpriortothedepositiononthefilamentsordirectlybydepositingtheuranylnitratesolutiononthefilaments.Inthelattercase,acalibrationwithuranylnitratestandardsmustbeperformed.1.3Thistestmethodcanalsoapplytoothernucleargradematrices(forexample,uraniumoxides)byprovidingachemi-caltransformationtouranylfluorideoruranylnitratesolution.1.4Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C696TestMethodsf...
