标准资料网-标准资料免费资源平台

【英文标准名称】:StandardTestMethodforMeasuringFast-NeutronReactionRatesbyRadioactivationofIron
【原文标准名称】:用铁的放射性测量快中子反应速率的标准试验方法
【标准号】:ASTME263-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:E10.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:fastneutrondetector;ironactivation;reactionrate;54Fe(n,p);Fastneutronflux/fluence;Iron;Neutronactivationreactions;Radioactivation--fastneutronflux;Thresholddetectors--2.2MeV
【摘要】:DESIG:E26309^TITLE:StandardTestMethodforMeasuringFast-NeutronReactionRatesbyRadioactivationofIron^SIGNUSE:RefertoGuideE844forguidanceontheselection,irradiation,andqualitycontrolofneutrondosimeters.RefertoPracticeE261forageneraldiscussionofthedeterminationoffast-neutronfluenceratewiththresholddetectors.Pureironintheformoffoilorwireisreadilyavailableandeasilyhandled.Fig.1showsaplotofcrosssectionasafunctionofneutronenergyforthefast-neutronreaction54Fe(n,p)54Mn(1).Thisfigureisforillustrativepurposesonlytoindicatetherangeofresponseofthe54Fe(n,p)54Mnreaction.RefertoGuideE1018fordescriptionsofrecommendedtabulateddosimetrycrosssections.54Mnhasahalf-lifeof312.13days(3)(2)andemitsagammaraywithanenergyof834.845keV(5).(2)Interferingactivitiesgeneratedbyneutronactivationarisingfromthermalorfastneutroninteractionsare2.57878(46)-h56Mn,44.95-d(8)59Fe,and5.2710-y(8)60Co(2,3).(ConsultRef(2)formoreprecisevaluescurrentlyacceptedforthehalf-lives.)Interferencefrom56Mncanbeeliminatedbywaiting48hbeforecounting.Althoughchemicalseparationof54Mnfromtheirradiatedironisthemosteffectivemethodforeliminating59Feand60Co,directcountingofironfor54Mnispossibleusinghigh-resolutiondetectorsystemsorunfoldingorstrippingtechniques,especiallyifthedosimeterwascoveredwithcadmiumorboronduringirradiation.Alteringtheisotopiccompositionoftheirondosimeterisanotherusefultechniqueforeliminatinginterferencefromextraneousactivitieswhendirectsamplecountingistobeemployed.Thevaporpressuresofmanganeseandironaresuchthatmanganesediffusionlossesfromironcanbecomesignificantattemperaturesaboveabout700x00B0;C.Therefore,precautionsmustbetakentoavoidthediffusionlossof54Mnfromirondosimetersathightemperature.Encapsulatingtheirondosimeterinquartzorvanadiumwillcontainthemanganeseattemperaturesuptoabout900x00B0;C.Sections6,7and8thatfollowwerespecificallywrittentodescribethemethodofchemicalseparationandsubsequentcountingofthe54Mnactivity.Whenoneelectstocounttheirondosimetersdirectly,thoseportionsofSections6,7and8thatpertaintoradiochemicalseparationshouldbedisregarded.Note18212;Thefollowingportionsofthistestmethodapplyalsotodirectsample-countingmethods:6.1-6.3,7.4,7.9,7.10,8.1-8.5,8.18,8.19,and10-13.FIG.154Fe(n,p)54MnCrossSection^SCOPE:1.1Thistestmethoddescribesproceduresformeasuringreactionratesbytheactivationreaction54Fe(n,p)54Mn.1.2Thisactivationreactionisusefulformeasuringneutronswithenergiesaboveapproximately2.2MeVandforirradiationtimesuptoabout3years(forlongerirradiations,seePracticeE261).1.3Withsuitabletechniques,fission-neutronfluenceratesabove108cmx2212;2x00B7;sx2212;1canbedetermin......
【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】:Rotatingelectricalmachines-Controlmotors-Steppingmotors
【原文标准名称】:旋转电机.控制电动机.步进电动机
【标准号】:BSDDIECTS60034-20-1-2002
【标准状态】:现行
【国别】:英国
【发布日期】:2002-06-21
【实施或试行日期】:2002-06-21
【发布单位】:英国标准学会(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:电动机;旋转电机;鼠笼式电动机;步进电动机;感应电动机;电气工程;定义;指导手册;电机
【英文主题词】:Definition;Definitions;Electricmachines;Electricmotors;Electricalengineering;Guidebooks;Inductionmotors;Rotatingelectricmachines;Rotatingelectricalmachinery;Squirrel-cagemotors;Steppingmotors
【摘要】:
【中国标准分类号】:K21
【国际标准分类号】:29_160_30
【页数】:40P;A4
【正文语种】:英语