Designation:C1844−16StandardTestMethodforDeterminationofUraniuminUrinebyInductivelyCoupledPlasmaMassSpectrometerFollowingNitricAcidDilution1ThisstandardisissuedunderthefixeddesignationC1844;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversthedeterminationofuraniuminurinebyInductivelyCoupledPlasmaMassSpectrometry(ICP-MS)afterdilutioninnitricacid.Themethodispresentedintwoparts.PartAdescribesamethodfordeterminationoftotaluraniuminurinethatdoesnotdistinguishbetweenuraniumisotopes.PartBdescribesamethodthatdeterminestheratioof235Uto238U(theenrichment)insamplesthatPartAhasshowntocontainlevelsofuraniumthattheuserofthedataconsiderstobesignificant.ThemeasurementinPartBmaybecombinedwiththemeasurementinPartAtocalculatea235Uconcentration.Theenrichmentmeasurementmayinturnbeusedtoestimatelevelsofminoruraniumisotopes,inparticular234U,thatareimportantforcalculatingtheinternalradiationdosereceivedbyanindividualexposedtouranium.Theestimationofminorisotopeconcentrationsandthecalcu-lationofinternaldosedoesnotformpartofthisstandard.1.2Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C859TerminologyRelatingtoNuclearMaterialsD1193SpecificationforReagentWater3.Terminology3.1Definitions—Fordefinitionsofotherstandardtermsinthistestmethod,refertoTerminologyC859.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1internalreferencestandard—asolutioncontainingnon-analyteelementsthatisanalyzedbytheICP-MSalongsideallsamples.Thes...
