【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
基本信息
标准名称: | 热轧钢板表面质量的一般要求 |
英文名称: | General requirement of surface finish for hot rolled steel plates |
中标分类: |
冶金 >>
钢铁产品 >>
钢板、钢带 |
ICS分类: |
冶金 >>
钢铁产品 >>
扁平钢和半成品
|
替代情况: | 被GB/T 14977-2008代替 |
发布部门: | 发布单位: |
发布日期: | 1994-04-05 |
实施日期: | 1995-01-01 |
首发日期: | 1994-04-05 |
作废日期: | 2009-10-01 |
主管部门: | 中国钢铁工业协会 |
提出单位: | 中华人民共和国冶金工业部 |
归口单位: | 冶金工业部信息标准研究院 |
起草单位: | 冶金部信息标准研究总院 |
起草人: | 黄东、邓濂献 |
出版社: | 中国标准出版社 |
出版日期: | 1995-01-01 |
页数: | 7页 |
适用范围
本标准规定了热轧钢板表面缺陷的深度,影响面积、限度、修整的要求及钢板厚度的限度。 本标准适用于厚度为>4mm~200mm的热轧钢板。
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类: 冶金 钢铁产品 钢板 钢带 冶金 钢铁产品 扁平钢和半成品