【英文标准名称】:StandardTestMethodforAnalysisofIsotopicCompositionofUraniuminNuclear-GradeFuelMaterialbyQuadrupoleInductivelyCoupledPlasma-MassSpectrometry
【原文标准名称】:四极感应耦合等离子质谱法分析核纯级燃料中铀的同位素组分的标准试验方法
【标准号】:ASTMC1474-2000(2006)e1
【标准状态】:现行
【国别】:
【发布日期】:2000
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C26.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:inductivelycoupledplasma-massspectrometry(ICP-MS);isotopicratio;uranium
【摘要】:Nuclear-gradereactorfuelmaterialmustmeetcertaincriteria,suchasthosedescribedinSpecificationsC753,C776,C778,andC833.Includedinthesecriteriaistheuraniumisotopiccomposition.Thistestmethodisdesignedtodemonstratewhetherornotagivenmaterialmeetsanisotopicrequirementandwhethertheeffectivefissilecontentisincompliancewiththepurchaserrsquo;specifications.1.1Thistestmethodisapplicabletothedeterminationoftheisotopiccompositionofuranium(U)innuclear-gradefuelmaterial.Thefollowingisotopicweightpercentagesaredeterminedusingaquadrupoleinductivelycoupledplasma-massspectrometer(Q-ICP-MS):233U,234U,235U,236U,and238U.Theanalysiscanbeperformedonvariousmaterialmatricesafteraciddissolutionandsampledilutionintowaterordilutenitric(HNO3)acid.Thesematerialsinclude:fuelproduct,uraniumoxide,uraniumoxidealloys,uranylnitrate(UNH)crystals,andsolutions.Thesamplepreparationdiscussedinthistestmethodfocusesonfuelproductmaterialbutmaybeusedforuraniumoxideorauraniumoxidealloy.Otherpreparationtechniquesmaybeusedandsomereferencesaregiven.Purificationoftheuraniumbyanion-exchangeextractionisnotrequiredforthistestmethod,asitisrequiredbyothertestmethodssuchasradiochemistryandthermalionizationmassspectroscopy(TIMS).ThistestmethodisalsodescribedinASTMSTP1344.1.2The233Uisotopeisprimarilymeasuredasaqualitativemeasureofitspresencebycomparingthe233Upeakintensitytoabackgroundpointsinceitisnotnormallyfoundpresentinmaterials.Theexampledatapresentedinthistestmethoddonotcontainany233Udata.A233UenrichedstandardisgiveninSection,anditmaybeusedasaquantitativespikeadditiontotheotherstandardmaterialslisted.1.3Asinglestandardcalibrationtechniqueisused.Optimalaccuracy(oralowbias)isachievedthroughtheuseofasinglestandardthatiscloselymatchedtotheenrichmentofthesamples.Theintensityorconcentrationisalsoadjustedtowithinacertaintolerancerangetoprovidegoodstatisticalcountingprecisionforthelow-abundanceisotopeswhilemaintainingalowbiasforthehigh-abundanceisotopes,resultingfromhigh-intensitydeadtimeeffects.Noblanksubtractionorbackgroundcorrectionisutilized.Dependinguponthestandardschosen,enrichmentsbetweendepletedand97%canbequantified.Thecalibrationandmeasurementsaremadebymeasuringtheintensityratiosofeachlow-abundanceisotopetotheintensitysumof233U,234U,235U,236U,and238U.Thehigh-abundanceisotopeisobtainedbydifference.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Theinstrumentiscalibratedandthesamplesmeasuredinunitsofisotopicweightpercent(Wt%).Forexample,the235UenrichmentmaybestatedasWt%235Uorasg235U/100gofU.Statementsregardingdilutions,particularlyforug/gconcentrationsorlower,aregivenassumingasolutiondensityof1.0sincetheuraniumconcentrationofasolutionisnotimportantwhenmakingisotopicratiomeasurementsotherthantomaintainareasonablyconsistentintensitywithinatolerancerange.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Specificprecautionarystatementsare......
【中国标准分类号】:F40
【国际标准分类号】:27_120_30
【页数】:9P.;A4
【正文语种】: