Designation:D1890−15StandardTestMethodforBetaParticleRadioactivityofWater1ThisstandardisissuedunderthefixeddesignationD1890;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthemeasurementofbetapar-ticleactivityofwater.Itisapplicabletobetaemittershavingmaximumenergiesabove0.1MeVandatactivitylevelsabove0.02Bq/mL(540pCi/L)ofradioactivehomogeneouswaterformostcountingsystems.Thistestmethodisnotapplicabletosamplescontainingradionuclidesthatarevolatileundercon-ditionsoftheanalysis.1.2Thistestmethodcanbeusedforeitherabsoluteorrelativedeterminations.Intracerwork,theresultsmaybeexpressedbycomparisonwithastandardwhichisdefinedtobe100%.Forradioassay,datamaybeexpressedintermsofaknownradionuclidestandardiftheradionuclidesofconcernareknownandnofractionationoccurredduringprocessing,ormaybeexpressedarbitrarilyintermsofsomeotherstandardsuchas137Cs.Generalinformationonradioactivityandmea-surementofradiationmaybefoundintheliterature2,3,4,5andPracticeD3648.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:6D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWaterD3370PracticesforSamplingWaterfromClosedConduitsD3648PracticesfortheMeasurementofRadioactivity3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1Becquerel—aunitofradioactivityequivalen...
