ASTM D2460-2007 水中镭的阿尔法粒子幅射同位素用标准试验方法

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【英文标准名称】:StandardTestMethodforAlpha-Particle-EmittingIsotopesofRadiuminWater
【原文标准名称】:水中镭的阿尔法粒子幅射同位素用标准试验方法
【标准号】:ASTMD2460-2007
【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】:D19.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:核能;放射性;放射性核素;镭;测试;水
【英文主题词】:alphaparticles;radioactivity;radiumisotopes;water
【摘要】:Radiumisoneofthemostradiotoxicelements.Itsisotopeofmass226isthemosthazardousbecauseofitslonghalf-life.Theisotopes223and224,althoughnotashazardous,areofsomeconcerninappraisingthequalityofwater.Thealpha-particle-emittingisotopesofradiumotherthanthatofmass226maybedeterminedbydifferenceifradium-226ismeasuredseparately,suchasbyTestMethodD3454.Notethatonefinds226Raand223Ratogetherinvariableproportions(5,6),but224Radoesnotnormallyoccurwiththem.Thus,223Raoftenmaybedeterminedbysimplysubtractingthe226Racontentfromthetotal:andif226Raand223Raarelow,224Ramaybedetermineddirectly.Thedeterminationofasingleisotopeinamixtureislessprecisethanifitoccurredalone.1.1Thistestmethodcoverstheseparationofdissolvedradiumfromwaterforthepurposeofmeasuringitsradioactivity.Althoughallradiumisotopesareseparated,thetestmethodislimitedtoalpha-particle-emittingisotopesbychoiceofradiationdetector.Themostimportantoftheseradioisotopesare223Ra,224Ra,and226Ra.Thelowerlimitofconcentrationtowhichthistestmethodisapplicableis3.7x10-2Bq/L(1pCi/L).1.2Thistestmethodmaybeusedforabsolutemeasurementsbycalibratingwithasuitablealpha-emittingradioisotopesuchas226Ra,orforrelativemethodsbycomparingmeasurementswitheachother.Mixturesofradiumisotopesmaybereportedasequivalent226Ra.Informationisalsoprovidedfromwhichtherelativecontributionsofradiumisotopesmaybecalculated.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Foraspecificprecautionarystatement,seeSection9.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50;13_060_60
【页数】:7P.;A4
【正文语种】: