Designation:C1561−10(Reapproved2016)StandardGuideforDeterminationofPlutoniumandNeptuniuminUraniumHexafluorideandU-RichMatrixbyAlphaSpectrometry1ThisstandardisissuedunderthefixeddesignationC1561;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thismethodcoversthedeterminationofplutoniumandneptuniumisotopesinuraniumhexafluoridebyalphaspectros-copy.Themethodcanalsobeapplicabletoanymatrixthatmaybeconvertedtoanitricacidsystem.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryrequirementspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C787SpecificationforUraniumHexafluorideforEnrich-mentC996SpecificationforUraniumHexafluorideEnrichedtoLessThan5%235UC1163PracticeforMountingActinidesforAlphaSpectrom-etryUsingNeodymiumFluorideC1475GuideforDeterminationofNeptunium-237inSoilD1193SpecificationforReagentWaterD3084PracticeforAlpha-ParticleSpectrometryofWaterD3648PracticesfortheMeasurementofRadioactivity3.Terminology3.1reagentblank—DIwaterprocessedthesameasthesamples;usedinthedeterminationoftheminimumdetectableactivity.3.2region-of-interest(ROI)—thechannels,orregion,inthealphaspectrainwhichthecountsduetoaspecificradioisotopeappearonafunctioningcalibratedalphaspectrometrysystem.4.SummaryofTestMethod4.1Analiquotofhydrolyzeduraniumhexafluorideequiva-lenttoapproximately0.5gofuraniumisconvertedtoanoxalicacid-nitricacidsystemandtheuraniumisselectivelyremovedviasolidphaseextraction.Plutoniumandneptuniumarefurtherpurifiedbyadditionalsolidphaseextractions.Theplutoniumandneptuniumarethenco-precipitatedwithneo-dymiumasthefluoridesandcountedbyalphaspectrometry.4.2Tracerrecoveriesusingthismethodaretypical...
