Designation:C1816−16StandardPracticeforTheIonExchangeSeparationofSmallVolumeSamplesContainingUranium,Americium,andPlutoniumPriortoIsotopicAbundanceandContentAnalysis1ThisstandardisissuedunderthefixeddesignationC1816;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticeisanalternativetoPracticeC1411fortheionexchangeseparationinsmallmasssamples(~5µgofplutoniumandupto0.5mgofuraniumin1mLofsolution)ofuraniumandplutoniumfromeachotherandfromotherimpuritiesforsubsequentisotopicabundanceandcontentanalysisbythermalionizationmassspectrometry(TIMS).Inadditiontobeingadaptedtosmallersamplesizes,thispracticealsoavoidstheuseofhydrochloricacid(HCl)andhydrofluoricacid(HF)anddoesnotrequiretheuseoftwoanionexchangecolumnsasrequiredinPracticeC1411.1.2Inchemicallyunseparatedsamplesisobaricnuclidesatmass238(238Uand238Pu),andmass241(241Puand241Am)willbemeasuredtogetherthuscompromisingtheaccuracyoftheresultsofisotopiccompositionofPu.Therefore,chemicalseparationofelementsisessentialpriortoisotopicanalyses.Concentrationsandvolumesgivenintheparagraphsbelowcanbemodifiedforlargersamplesizes,differenttypesofanionexchangeresin,etc.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C698TestMethodsforChemical,MassSpectrometric,andSpectrochemicalAnalysisofNuclear-GradeMixedOx-ides((U,Pu)O2)C833SpecificationforSintered(Uranium-Plutonium)Diox-idePelletsC859TerminologyRelatingtoNuclearMaterialsC1008SpecificationforSintered(Uranium-Plutonium)DioxidePe...
