Designation:C1429−99(Reapproved2014)StandardTestMethodforIsotopicAnalysisofUraniumHexafluoridebyDouble-StandardMulti-CollectorGasMassSpectrometer1ThisstandardisissuedunderthefixeddesignationC1429;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaquantitativetestmethodapplicabletodeterminingthemasspercentofuraniumisotopesinuraniumhexafluoride(UF6)samples.Thismethodasde-scribedisforconcentrationsof235Ubetween0.1and10mass%,and234Uand236Ubetween0.0001and0.1mass%.1.2Thistestmethodisforlaboratoryanalysisbyagasmassspectrometerwithamulti-collector.1.3ThisstandardcomplementsTestMethodsC761,thedouble-standardmethodforgasmassspectrometersusingasinglecollector,byprovidingamethodforspectrometersusingamulti-collector.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C761TestMethodsforChemical,MassSpectrometric,Spectrochemical,Nuclear,andRadiochemicalAnalysisofUraniumHexafluorideC787SpecificationforUraniumHexafluorideforEnrich-mentC996SpecificationforUraniumHexafluorideEnrichedtoLessThan5%235UC1215GuideforPreparingandInterpretingPrecisionandBiasStatementsinTestMethodStandardsUsedintheNuclearIndustry3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1Astandard,n—thelow-valuestandardofastandardpairthatbracketsthesample.3.1.2Bstandard,n—thehigh-valuestandardofastandardpairthatbracketsthesample.3.1.3determination,n—asingleisotopicvalue,calculatedfromasequenceofratios;themostbasicisotopicvaluecalculated.3.1.4Lagrange’sinterpolationformula,n—amathematicalequationdesignedtoestimatevaluesbetweentwoormoreknownv...
