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【英文标准名称】:StandardPracticeforUseofaCeric-CerousSulfateDosimetrySystem
【原文标准名称】:高铈-三价铈硫酸剂量测定系统应用的实施规程
【标准号】:ASTMISO/ASTM51205-2009
【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】:E10.01
【标准类型】:(ISO/ASTM)
【标准水平】:()
【中文主题词】:
【英文主题词】:absorbeddose;ceric-ceroussulfatedosimeter;dose;dosemeasurement;dosimeter;dosimetrysystem;electronbeam;gammaradiation;ionizingradiation;irradiation;photons;radiation;radiationprocessing;reference-standarddosimeter;Xrays;ICS
【摘要】:4.1Theceric-ceroussystemprovidesareliablemeansfordeterminingabsorbeddosetowater.Itisbasedonaprocessofreductionofcericionstocerousionsinacidicaqueoussolutionbyionizingradiation(1,4).NOTE3-Theceric-ceroussystemdescribedinthepracticehasceroussulfateaddedtotheinitialsolutiontoreducetheeffectoforganicimpuritiesandtoallowthepotentiometricmethodofmeasurement.Othersystemsusedfordosimetryincludesolutionsofcericsulfateorcericammoniumsulfateinsulfuricacidwithouttheinitialadditionofceroussulfate.Theseothersystemsarebasedonthesameprocessofreductionofcericionstocerousionsbutarenotincludedinthispractice.4.2Thedosimeterisasolutionofcericsulfateandceroussulfateinsulfuricacidinanappropriatecontainersuchasaflame-sealedglassampoule.Thesolutionindicatesalevelofabsorbeddosebyachange(decrease)inopticalabsorbanceataspecifiedwavelengthintheultravioletregion,orachange(increase)inelectropotential.Acalibratedspectrophotometerisusedtodeterminetheabsorbanceandapotentiometer,withaspeciallydesignedcell,isusedtodeterminetheelectropotentialinmillivolts.4.3Thedosimeterresponsehasanirradiationtemperaturedependencesincetheradiationchemicalyield(G~Ce31!)dependsontemperature.ThedependenceofG~Ce31!isapproximatelyequalto-0.2%perdegreeCelsiusbetween0and62癈(3,5,6).Thisirradiationtemperaturedependencehasaslightdependenceontheinitialcerousionconcentration(see10.6.3).4.4Theabsorbeddosetomaterialsotherthanwaterwhenirradiatedunderequivalentconditionsmaybecalculated.ProceduresformakingsuchcalculationsaregiveninASTMPracticesE666andE668andISO/ASTMGuide51261.NOTE4-Foracomprehensivediscussionofvariousdosimetrymethodsapplicabletotheradiationtypesandenergiesdiscussedinthispractice,seeICRUReports14,34,35,and37.1.1Thispracticecoversthepreparation,testing,andprocedureforusingtheceric-ceroussulfatedosimetrysystemtomeasureabsorbeddoseinwaterwhenexposedtoionizingradiation.Thesystemconsistsofadosimeterandappropriateanalyticalinstrumentation.Forsimplicity,thesystemwillbereferredtoastheceric-ceroussystem.Itisclassifiedasareferencestandarddosimetrysystem(seeISO/ASTMGuide51261).Ceric-cerousdosimetersarealsousedastransfer-standarddosimetersorroutinedosimeters.1.2Thispracticedescribesboththespectrophotometricandthepotentiometricreadoutproceduresfortheceric-ceroussystems.1.3Thispracticeappliesonlyto947;rays,Xrays,andhighenergyelectrons.1.4Thispracticeappliesprovidedthefollowingaresatisfied:1.4.1Theabsorbed-doserangeshallbebetween5102and5104Gy(1).1.4.2Theabsorbed-doserateshallbelessthan106Gy/s(1).1.4.3Forradionuclidegamma-raysources,theinitialphotonenergyshallbegreaterthan0.6MeV.Forbremsstrahlungphotons,theinitialenergyoftheelectronsusedtoproducethebremsstrahlungphotonsshallbeequaltoorgreaterthan2MeV.Forelectronbeams,theinitialelectronenergyshallbegreaterthan8MeV.Note18212;Thelowerenergylimitsareappropriateforacylindricaldosimeterampouleof12-mmdiameter.Correctionsfordosegradientsacrossanampouleofthatdiameterorlessarenotrequiredforphotons,butmayberequiredforelectronbeams(2).Theceric-ceroussystemmaybeusedatlowerenergiesbyemployingthinner(inthebeamdirection)dosimetercontainers(seeICRUReport35).1.4.4Theirradiationtemperatureofthedosimetershallbebetween0and62176;C(3).Note28212;Thetemperaturecoefficientofdosimeterresponseisknownonlyin......
【中国标准分类号】:
【国际标准分类号】:
【页数】:11P.;A4
【正文语种】:英语