ASTM E720-2008 电子辐射强度试验中中子波谱测定用中子探测器的选择和使用标准指南

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【英文标准名称】:StandardGuideforSelectionandUseofNeutronSensorsforDeterminingNeutronSpectraEmployedinRadiation-HardnessTestingofElectronics
【原文标准名称】:电子辐射强度试验中中子波谱测定用中子探测器的选择和使用标准指南
【标准号】:ASTME720-2008
【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】:E10.07
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:activationfoils;neutronactivation;neutronspectra;radiation-hardnesstesting
【摘要】:Becauseofthewidevarietyofmaterialsbeingusedinneutron-activationmeasurements,thisguideispresentedwiththeobjectiveofbringingimproveduniformitytothespecificfieldofinteresthere:hardnesstestingofelectronicsprimarilyincriticalassemblyreactorenvironments.NOTE2Someofthetechniquesdiscussedareusefulfor14-MeVdosimetry.SeeTestMethodE496foractivationdetectormaterialssuitablefor14-MeVneutroneffectstesting.NOTE3Thematerialsrecommendedinthisguidearesuitablefor252Cforotherweaksourceeffectstestingprovidedthefluenceissufficienttogeneratecountableactivities.Thisguideisorganizedintotwooverlappingsubjects;thecriteriausedforsensorselection,andtheproceduresusedtoensuretheproperdeterminationofactivitiesfordeterminationofneutronspectra.SeeTerminologyE170andGeneralMethodsE181.DeterminationofneutronspectrawithactivationsensordataisdiscussedinGuidesE721andE944.1.1Thisguidecoverstheselectionanduseofneutron-activationdetectormaterialstobeemployedinneutronspectraadjustmenttechniquesusedforradiation-hardnesstestingofelectronicsemiconductordevices.Sensorsaredescribedthathavebeenusedatmanyradiationhardness-testingfacilities,andcommentsareofferedintablefootnotesconcerningtheappropriatenessofeachreactionasjudgedbyitscross-sectionaccuracy,easeofuseasasensor,andbypastsuccessfulapplication.Thisguidealsodiscussesthefluence-uniformity,neutronself-shielding,andfluence-depressioncorrectionsthatneedtobeconsideredinchoosingthesensorthickness,thesensorcovers,andthesensorlocations.TheseconsiderationsarerelevantforthedeterminationofneutronspectrafromassembliessuchasTRIGA-andGodiva-typereactorsandfromCaliforniumirradiators.Thisguidemayalsobeapplicabletootherbroadenergydistributionsourcesupto20MeV.Note1Fordefinitionsonterminologyusedinthisguide,seeTerminologyE170.1.2Thisguidealsocoversthemeasurementofthegamma-rayorbeta-rayemissionratesfromtheactivationfoilsandothersensorsaswellasthecalculationoftheabsolutespecificactivitiesofthesefoils.Theprincipalmeasurementtechniqueishigh-resolutiongamma-rayspectrometry.Theactivitiesareusedinthedeterminationoftheenergy-fluencespectrumoftheneutronsource.SeeGuideE721.1.3Detailsofmeasurementandanalysisarecoveredasfollows:1.3.1Correctionsinvolvedinmeasuringthesensoractivitiesincludethoseforfinitesensorsizeandthicknessinthecalibrationofthegamma-raydetector,forpulse-heightanalyzerdeadtimeandpulse-pileuplosses,andforbackgroundradioactivity.1.3.2Theprimarymethodfordetectorcalibrationthatusessecondarystandardgamma-rayemittingsourcesisconsideredinthisguideandinGeneralMethodsE181.Inaddition,analternativemethodinwhichthesensorsareactivatedintheknownspectrumofabenchmarkneutronfieldisdiscussedinGuideE1018.1.3.3Adataanalysismethodispresentedwhichaccountsforthefollowing:detectorefficiency;backgroundsubtraction;irradiation,waiting,andcountingtimes;fissionyieldsandgamma-raybranchingratios;andself-absorptionofgammaraysandneutronsinthesensors.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:F80
【国际标准分类号】:83_140_10
【页数】:12P.;A4
【正文语种】:英语