Designation:D7727−21StandardPracticeforCalculationofDoseEquivalentXenon(DEX)forRadioactiveXenonFissionProductsinReactorCoolant1ThisstandardisissuedunderthefixeddesignationD7727;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeappliestothecalculationofthedoseequivalentto133Xeinthereactorcoolantofnuclearpowerreactorsresultingfromtheradioactivityofallnoblegasfissionproducts.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3648PracticesfortheMeasurementofRadioactivityD7282PracticeforSet-up,Calibration,andQualityControlofInstrumentsUsedforRadioactivityMeasurementsD7902TerminologyforRadiochemicalAnalyses3.Terminology3.1Definitions:3.1.1dose-equivalentXe-133(DEX),n—shallbethat133Xeconcentration(microcuriespergram)thatalonewouldproducethesameacutedosetothewholebodyasthecombinedactivitiesofnoble-gasnuclides85mKr,85Kr,87Kr,88Kr,131mXe,133mXe,133Xe,135mXe,135Xe,and138Xeactuallypresent.3.1.1.1Discussion—ThisisthegeneraldefinitionofDEX.EachutilitymayhaveadoptedmodificationstothisdefinitionthroughagreementwiththeU.S.NuclearRegulatoryCommis-sion(...
