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Identification of the unknown shielding parameters with gammaray spectrum using a derivative-free inverse radiation transport model

【摘要】Identifyingtheunknowngeometricandmaterialinformationofamulti-shieldobjectbyanalyzingtheradiationsignaturemeasurementsisalwaysanimportantprobleminnationalandglobalsecurity.Inordertoidentifytheunknownshieldinglayerthicknessesofasource/shieldsystemwithgamma-rayspectra,wehavedevelopedaderivative-freeinverseradiationtransportmodelbasedonadifferentialevolutionalgorithmwithglobalandlocalneighbourhoods(IRT-DEGL).Inthepresentpaper,theIRT-DEGLmodelisfurtherextendedforestimatingtheunknownthicknesseswithrandominitialguessesandmaterialmassdensitiesofmulti-shieldinglayersaswellastheircombinations.Usingthedetectedgamma-rayspectra,theillustrationofinversestudiesisimplementedandthemaininfluencefactorsforinverseresultsarealsoanalyzed.

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285 共7页 核技术:英文版 2018年5期 免费 中文科技期刊数据库

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