ASTM C1726/C1726M-2010 无源γ射线测量用模型的标准使用指南

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【英文标准名称】:StandardGuideforUseofModelingforPassiveGammaMeasurements
【原文标准名称】:无源γ射线测量用模型的标准使用指南
【标准号】:ASTMC1726/C1726M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:C26.10
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:
【英文主题词】:efficiencycalibration;far-fieldapproximation;generalizedgeometryholdup;infiniteplane;nondestructiveassay;radiationtransportmodeling;spectroscopy;voxel-intrinsicefficiency
【摘要】:Thefollowingmethodsassistindemonstratingregulatorycomplianceinsuchareasassafeguards(SpecialNuclearMaterial),inventorycontrol,criticalitycontrol,decontaminationanddecommissioning,wastedisposal,holdupandshipping.Thisguidecanapplytotheassayofradionuclidesincontainers,whosegamma-rayabsorptionpropertiescanbemeasuredorestimated,forwhichrepresentativecertifiedstandardsarenotavailable.Itcanbeappliedtoinsitumeasurements,measurementstations,ortolaboratorymeasurements.Someofthemodelingtechniquesdescribedintheguidearesuitableforthemeasurementoffall-outornaturalradioactivityhomogenouslydistributedinsoil.Source-basedefficiencycalibrationsforlaboratorygeometriesmaysufferfrominaccuraciesduetogammaraysbeingdetectedintruecoincidence.Modelingcanbeanadvantagesinceitisunaffectedbytruecoincidencesummingeffects.1.1Thisguideaddressestheuseofmodelswithpassivegamma-raymeasurementsystems.Mathematicalmodelsbasedonphysicalprinciplescanbeusedtoassistincalibrationofgamma-raymeasurementsystemsandinanalysisofmeasurementdata.Somenondestructiveassay(NDA)measurementprogramsinvolvetheassayofawidevarietyofitemgeometriesandmatrixcombinationsforwhichthedevelopmentofphysicalstandardsarenotpractical.Inthesesituations,modelingmayprovideacost-effectivemeansofmeetinguserx2019;sdataqualityobjectives.1.2Ascientificknowledgeofradiationsourcesanddetectors,calibrationprocedures,geometryanderroranalysisisneededforusersofthisstandard.Thisguideassumesthattheuserhas,ataminimum,abasicunderstandingoftheseprinciplesandgoodNDApractices(seeGuideC1592),asdefinedforanNDAprofessionalinGuideC1490.Theuserofthisstandardmusthaveatleastabasicunderstandingofthesoftwareusedformodeling.Instructionsorfurthertrainingontheuseofsuchsoftwareisbeyondthescopeofthisstandard.1.3Thefocusofthisguideistheuseofresponsemodelsforhigh-puritygermanium(HPGe)detectorsystemsforthepassivegamma-rayassayofitems.Manyofthemodelsdescribedinthisguidemayalsobeappliedtotheuseofdetectorswithdifferentresolutions,suchassodiumiodideorlanthanumhalide.Insuchcases,anNDAprofessionalshoulddeterminetheapplicabilityofsectionsofthisguidetothespecificapplication.1.4Techniquesdiscussedinthisguideareapplicabletomodelingavarietyofradioactivematerialincludingcontaminatedfields,walls,containersandprocessequipment.1.5Thisguidedoesnotpurporttodiscussmodelingforx201C;infiniteplanex201D;insitumeasurements.ThisdiscussionisbestcoveredinANSIN42.28.1.6Thisguidedoesnotpurporttoaddressthephysicalconcernsofhowtomakeorsetupequipmentforinsitumeasurementsbutonlyhowtoselectthemodelforwhichtheinsitumeasurementdataisanalyzed.1.7ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.8Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandaren......
【中国标准分类号】:F74
【国际标准分类号】:17_240
【页数】:7P.;A4
【正文语种】:英语