Designation:C1133/C1133M−10StandardTestMethodforNondestructiveAssayofSpecialNuclearMaterialinLow-DensityScrapandWastebySegmentedPassiveGamma-RayScanning1ThisstandardisissuedunderthefixeddesignationC1133/C1133M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthetransmission-correctednon-destructiveassay(NDA)ofgamma-rayemittingspecialnuclearmaterials(SNMs),mostcommonly235U,239Pu,and241Am,inlow-densityscraporwaste,packagedincylin-dricalcontainers.ThemethodcanalsobeappliedtoNDAofothergamma-emittingnuclidesincludingfissionproducts.High-resolutiongamma-rayspectroscopyisusedtodetectandmeasurethenuclidesofinterestandtomeasureandcorrectforgamma-rayattenuationinaseriesofhorizontalsegments(collimatedgammadetectorviews)ofthecontainer.Correc-tionsarealsomadeforcountinglossesoccasionedbysignalprocessinglimitations(1-3).21.2TherearecurrentlyseveralsystemsinuseorunderdevelopmentfordeterminingtheattenuationcorrectionsforNDAofradioisotopicmaterials(4-8).Arelatedtechnique,tomographicgamma-rayscanning(TGS),isnotincludedinthistestmethod(9,10,11).1.2.1ThistestmethodwillcovertwoimplementationsoftheSegmentedGammaScanning(SGS)procedure:(1)IsotopeSpecific(Mass)Calibration,theoriginalSGSprocedure,usesstandardsofknownradionuclidemassestodeterminedetectorresponseinamassversuscorrectedcountratecalibrationthatappliesonlytothosespecificradionuclidesforwhichitiscalibrated,and(2)EfficiencyCurveCalibration,analternativemethod,typicallyusesnon-SNMradionuclidesourcestodeterminesystemdetectionefficiencyvs.gammaenergyandtherebycalibrateforallgamma-emittingradionuclidesofinterest(12).1.2.1.1EfficiencyCurveCalibration,overtheenergyrangeforwhichtheefficiencyisdefined,hastheadvantageofprovidingcalibrationformanygamma-emittingnuclidesforwhichhalf-lifeandgammaemissioninte...
