【英文标准名称】:StandardTestMethodforDeterminingtheContentofCesium-137inIrradiatedNuclearFuelsbyHigh-ResolutionGamma-RaySpectralAnalysis
【原文标准名称】:用高分辨率γ射线光谱分析法对照射过的核燃料中的铯137的标准试验方法
【标准号】:ASTME692-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:Cesium-137;gamma-rayspectrometer;nuclearfuel;percentfission;Cesium-137;Gammaradiation--nuclearmaterials/applications;High-resolutiongamma-rayspectralanalysis;Nuclearfuels(reactor);Plutonium;Uranium
【摘要】:Thistestmethodusesahigh-resolutiongamma-rayspectrometerasabasisformeasuringthegamma-rayemissionrateof137Cs-137mBainadilutenitricacidsolutioncontaining10mg/Lofcesiumcarrier.Nochemicalseparationofthecesiumfromthedissolved-fuelsolutionisrequired.Theprincipalstepsconsistofdilutingaweighedaliquotofthedissolved-fuelsolutionwithaknownmassof1Mnitricacid(HNO3)andmeasuringthe662keVgamma-raycountratefromthesample,thenmeasuringthe662keVgamma-raycountratefromastandardsourcethathasthesamephysicalformandcountinggeometryasthesample.Theamountoffuelsamplerequiredfortheanalysisissmall.Forasamplecontaining0.1goffuelirradiatedtooneatompercentfission,anetcountrateofapproximately105countspersecondwillbeobservedforacountinggeometrythatyieldsafull-energypeakefficiencyfractionof1x00D7;10-3.Theadvantageofthissmallamountofsampleisthattheconcentrationoffuelmaterialcanbekeptatlevelswellbelow1g/L,whichresultsinnegligibleself-absorptioninthesamplealiquotandasmallradiationhazardtotheanalyst.1.1Thistestmethodcoversthedeterminationofthenumberofatomsof137Csinaqueoussolutionsofirradiateduraniumandplutoniumnuclearfuel.Whencombinedwithamethodfordeterminingtheinitialnumberoffissileatomsinthefuel,theresultsofthisanalysisallowsatompercentfission(burn-up)tobecalculated(1).Thedeterminationofatompercentfission,uraniumandplutoniumconcentrations,andisotopicabundancesarecoveredinTestMethodsE267andE321.1.2137Csisnotsuitableasafissionmonitorforsamplesthatmayhavelostcesiumduringreactoroperation.Forexample,alargetemperaturegradientenhances137Csmigrationfromthefuelregiontocoolerregionssuchastheradialfuel-cladgap,or,toalesserextent,towardstheaxialfuelend.1.3Anonuniform137Csdistributionshouldalerttheanalysttothepotentiallossofthefissionproductnuclide.The137Csdistributionmaybeascertainedbyanaxialgamma-rayscanofthefuelelementtobeassayed.Inamixed-oxidefuel,comparisonofthe137Csdistributionwiththedistributionofnonmigratingfission-productnuclidessuchas95Zror144Cewouldindicatetherelativedegreeof137Csmigration.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitesofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F46
【国际标准分类号】:27_120_30
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Anhydroushydrogenfluorideforindustrialuse;Determinationofwatercontent;Conductimetricmethod
【原文标准名称】:工业用无水氟化氢水含量的测定电导法
【标准号】:ISO3700-1980
【标准状态】:作废
【国别】:国际
【发布日期】:1980-09
【实施或试行日期】:
【发布单位】:国际标准化组织(ISO)
【起草单位】:ISO/TC47
【标准类型】:()
【标准水平】:()
【中文主题词】:电导测量法;水;氟化氢;含量测定;化学分析和试验
【英文主题词】:chemicalanalysisandtesting;water;conductimetricmethods;hydrogenfluoride;determinationofcontent
【摘要】:
【中国标准分类号】:G11
【国际标准分类号】:71_060_30
【页数】:8P;A4
【正文语种】:英语