Designation:C1344−97(Reapproved2013)StandardTestMethodforIsotopicAnalysisofUraniumHexafluoridebySingle-StandardGasSourceMassSpectrometerMethod1ThisstandardisissuedunderthefixeddesignationC1344;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheisotopicanalysisofuraniumhexafluoride(UF6)andmaybeusedfortheentirerangeof235Uisotopiccompositionsforwhichstandardsareavailable.1.2ThistestmethodisapplicabletothedeterminationoftheisotopicrelationshipbetweentwoUF6samples.Iftheabundanceofaspecificisotopeofonesample(thestandard)isknown,itsabundanceintheothercanbedetermined.Thistestmethodisflexibleinthatthenumberoftimesagivenmaterialisadmittedtotheionsourcemaybeadjustedtotheminimumrequiredforaspecifiedprecisionlevel.1.3Thesensitivitywithwhichdifferencesbetweentwomaterialscanbedetecteddependsonthemeasuringsystemused,butratio-measuringdevicescangenerallyreadratio-of-molratiodifferencesassmallas0.0001.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SpecifichazardsstatementsaregiveninSection7.2.ReferencedDocuments2.1ASTMStandards:2C787SpecificationforUraniumHexafluorideforEnrich-mentC996SpecificationforUraniumHexafluorideEnrichedtoLessThan5%235U2.2OtherDocument:USEC-651,UraniumHexafluoride:AManualofGoodHandlingPractices33.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1dropthrough,n—ameasurementoftheamountofthe238UF5+ionbeamthatcanbepassedthroughthe235UF5+collectorslitandmeasuredonthe235UF5+collector,statedasapercentageofthetotal238UF5+signa...
