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【英文标准名称】:StandardPracticeforUseofCalorimetricDosimetrySystemsforElectronBeamDoseMeasurementsandRoutineDosimeterCalibration
【原文标准名称】:电子束剂量计测量和剂量计校准用量热剂量测定法系统使用的标准惯例
【标准号】:ASTMISO/ASTM51631-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【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】:吸收剂量;标准;热量计;热量测定;剂量计;剂量测定;电子加速器;电子束;黑铅;电离辐射;辐射;聚苯乙烯;放射;辐射处理;水;ICS
【英文主题词】:absorbeddose;calibration;calorimeter;calorimetry;dosimeter;dosimetry;electronaccelerator;electronbeam;graphite;ionizingradiation;irradiation;polystyrene;radiation;radiationprocessing;water;ICS
【摘要】:4.1Thispracticeisapplicabletotheuseofacalorimeterforthemeasurementofabsorbeddoseinelectronbeams,thequalificationofelectronirradiationfacilities,periodicchecksofoperatingparametersofelectronirradiationfacilities,andcalibrationofotherdosimetersinelectronbeams.NOTE1-Foradditionalinformationoftheuseofdosimetryinelectronacceleratorfacilities,seeISO/ASTMPractices51431and51649,andICRUReports34and35,andRefs(1-3).44.2Thecalorimetersdescribedinthispracticearenotprimary-standarddosimeters.Theymaybeusedastransferstandarddosimetersorasinternalstandardsatanelectronbeamirradiationfacility,ormayberoutinedosimetersusedforroutinedosemeasurements.Thecalorimetersarecalibratedbycomparisonwithtransfer-standarddosimeters.4.3Thedosemeasurementisbasedonthemeasurementofthetemperatureriseinanabsorber(calorimetricbody)irradiatedbyanelectronbeam.Differentabsorbingmaterialsareused,buttheresponseisusuallydefinedintermsofdosetowater.4.4Theabsorbeddoseinothermaterialsirradiatedunderequivalentconditionsmaybecalculated.ProceduresformakingsuchcalculationsaregiveninASTMPracticesE666andE668,ISO/ASTMGuide51261,andRef(1).4.5Theaverageabsorbeddoseinthevolumeofthecalorimetricbodyismeasured.Dosegradientsmayoccurinthisvolumeandmayhavetobeconsideredwhenestimatingdoseinothermaterials.4.6Thecalorimetricbodiesofthecalorimetersdescribedinthispracticearemadefromlowatomicnumbermaterials.Theelectronfluenceswithinthesecalorimetricbodieswillbeapproximatelyequalwhenirradiatedwithelectronbeamsof1.5MeVorhigher.Calibrationintermsofdosetowaterispossibleforthesecalorimeters.4.6.1Calorimetersforuseatindustrialelectronacceleratorshavebeenconstructedusinggraphite,polystyreneoraPetridishfilledwithwaterasthecalorimetricbody(4-10).Thethicknessofthecalorimetricbodyshallbelessthantherangeoftheelectronsforthespecifiedmaterial.4.6.2Polymericmaterialsotherthanpolystyrenemaybeusedforcalorimetricmeasurements.Polystyreneisusedbecauseitisknowntoberesistanttoradiation(11)andbecausenoexo-orendothermicreactionstakeplace(12).1.1Thispracticecoversthepreparationanduseofsemi-adiabaticcalorimetersformeasurementofabsorbeddoseandroutinedosimetercalibrationwhenirradiatedwithelectronsforradiationprocessingapplications.Thecalorimetersareeithertransportedbyaconveyorpastascannedelectronbeamorarestationaryinabroadenedbeam.1.2Thispracticeappliestoelectronbeamsintheenergyrangefrom1.5to12MeV.1.3Theabsorbeddoserangedependsontheabsorbingmaterialandtheirradiationandmeasurementconditions.Minimumdoseisapproximately100Gyandmaximumdoseisapproximately50kGy.1.4Theaveragedabsorbed-doseraterangeshallgenerallybegreaterthan10Gys1.1.5Thetemperaturerangeforuseofthesecalorimetersdependsonthethermalresistanceofthematerials,onthecalibrationrangeofthetemperaturesensor,andonthesensitivityofthemeasurementdevice.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A58
【国际标准分类号】:17_240
【页数】:9P.;A4
【正文语种】: