Designation:C1205−07(Reapproved2012)StandardTestMethodforTheRadiochemicalDeterminationofAmericium-241inSoilbyAlphaSpectrometry1ThisstandardisissuedunderthefixeddesignationC1205;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thismethodcoversthedeterminationofameri-cium–241insoilbymeansofchemicalseparationsandalphaspectrometry.Itisdesignedtoanalyzeuptotengramsofsoilorothersamplematricesthatcontainupto30mgofcombinedrareearths.Thismethodallowsthedeterminationofameri-cium–241concentrationsfromambientlevelstoapplicablestandards.ThevaluesstatedinSIunitsaretoberegardedasstandard.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificprecautionstatements,seeSection10.2.ReferencedDocuments2.1ASTMStandards:2C859TerminologyRelatingtoNuclearMaterialsC998PracticeforSamplingSurfaceSoilforRadionuclidesC999PracticeforSoilSamplePreparationfortheDetermi-nationofRadionuclidesC1163PracticeforMountingActinidesforAlphaSpectrom-etryUsingNeodymiumFluorideD1193SpecificationforReagentWaterD3084PracticeforAlpha-ParticleSpectrometryofWaterD3648PracticesfortheMeasurementofRadioactivity3.Terminology3.1Fordefinitionsoftermsinthisstandard,refertoTerminologyC859.4.SummaryofTestMethod4.1Americium–241isdeterminedinpreparedsoilsamplesofupto10g.Thesoiliscompletelydissolvedbyuseofpyrosulfatefusion.Afteraninitialseparationonbariumsulfateandextractionwithanorganophosphorouscompound,theamericiumisseparatedfromtheothertrivalentactinidesandtherareearthsbyoxidationoftheamericiumandprecipitationoftheinterferences.Theamericiumispreparedforalphaspectrometrybycoprecipitationwithneodymiumfluoridean...
