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【英文标准名称】:StandardTestMethodforDeterminationofUraniumorPlutoniumIsotopicCompositionorConcentrationbytheTotalEvaporationMethodUsingaThermalIonizationMassSpectrometer
【原文标准名称】:用热电离质谱分光计通过总数蒸发法测定铀或钚同位素组成或浓度的标准试验方法
【标准号】:ASTMC1672-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:组分;浓缩;测定;蒸发;裂变材料;电离;同位素;质谱学;钚;分光计;测试;热的;铀
【英文主题词】:atompercent;isotopedilutionmassspectrometry;isotopiccomposition;massfractionation;plutonium;thermalionizationmassspectrometry;totalevaporation;uranium;weightpercent
【摘要】:1.1Thismethoddescribesthedeterminationoftheisotopiccompositionand/ortheconcentrationofuraniumandplutoniumasnitratesolutionsbythethermalionizationmassspectrometric(TIMS)totalevaporationmethod.Purifieduraniumorplutoniumnitratesolutionsareloadedontoadegassedmetalfilamentandplacedinthemassspectrometer.Undercomputercontrol,ioncurrentsaregeneratedbyheatingofthefilament(s).Theionbeamsarecontinuallymeasureduntilthesampleisexhausted.Themeasuredioncurrentsareintegratedoverthecourseoftherun,andnormalizedtoareferenceisotopeioncurrenttoyieldisotopicratios.1.2Inprinciple,thetotalevaporationmethodshouldyieldisotopicratiosthatdonotrequiremassbiascorrection.Inpractice,somesamplesmayrequirethisbiascorrection.WhencomparedtotheconventionalTIMSmethod,thetotalevaporationmethodisapproximatelytwotimesfaster,improvesprecisionfromtwotofourfold,andutilizessmallersamplesizes.1.3Thetotalevaporationmethodmayleadtobiasesinminorisotoperatiosduetopeaktailingfromadjacentmajorisotopes,dependingonsamplecharacteristics.Theuseofanelectronmultiplierequippedwithanenergyfiltermayeliminateordiminishpeaktailingeffects.Measurementofinstrumentabundancesensitivitymaybeusedtoensurethatsuchbiasesarenegligible,ormaybeusedtobiascorrectminorisotoperatios.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F46
【国际标准分类号】:27_120_30
【页数】:10P.;A4
【正文语种】: