高纯锗探测器探测效率的MCNP模拟-张建芳

485Vol．48No．520109JournalofJilinUniversityScienceEditionSep2010MCNP1112111．1300122．114005HPGe152Eu133Ba15cmMonteCarloHPGe．HPGe0．22cm0．301cm1．00cm．MonteCarloO434．1A1671-5489201005-0843-04MCNPSimulationofHigh-PurityGermaniumDetectorEfficiencyZHANGJian-fang1ZHAOGuang-yi1WANGYu-de1WANGMing-yong2MAYu-gang1ZHANGHui11．CollegeofPhysicsJilinUniversityChangchun130012China2．DepartmentofPhysicsAnshanNormalCollegeAnshan114005LiaoningProvinceChinaAbstractTheexperimentaldetectionefficiencyof152Euand133Baat15cmwasmeasuredviacoaxialhigh-puritygermaniumHPGedetector．ThenthecoaxialHPGedetectorpeakefficiencywassimulatedviaMonteCarlomethodtoadjustdetectordeadlayerthicknessandcold-fingersize．TheresultsshowthatwhentheHPGedetectordeadlayerthicknessis0．22cmthethicknessandlengthofcold-fingersizeare0．301cmand1cmthesimulatedefficiencyisconsistentwiththeexperimentalefficiency．Keywordshigh-puritygermaniumdetectorpeakdetectionefficiencyMonteCarlomethoddeadlayerthicknesscold-fingersize2009-11-16．1984—[e-mail]．1969—[e-mail]．J0730311．γX、keV～MeV．1．γ．、γ．．MonteCarlo．γ．εspEγ2εspEγ=γ=NpAPγt1NptAPγEγγt．1γγ、Eγ＞1．02MeV--、．．1Fig．1EquivalentcircuitofHPGedetector31．CRRVttctcr×10－8sr．RCRCtc．2MCNPMonteCarloMCNP-4C、、X41keV～100MeVγ．γHPGe．γ．MonteCarloHPGeF8E8．F8γHPGeE8．MCNP-4C5EFWHM=a+bEγ+cE2槡γ2EγγMeVEFWHMabc．32Fig．2ModelofsimulatedHPGedetector20．07cmAl0．127cmGe4．69cm2．78cm3．5cmBe0．001cm．MonteCarloF8γHPGe．4γγγ44848γ5．MonteCarlo．MonteCarloMCNP-4C、1keV1071．0%．4．1γ152Eu133Ba15cm1．10．22cm．1Table1Efficiencyofsimulationresultsasafunctionofdeadlayerthickness/cm/keV0．0781．02．89×10－32．69×10－3121．83．08×10－32．67×10－3244．72．27×10－32．00×10－3276．42．07×10－31．77×10－3302．91．94×10－31．52×10－3344．31．74×10－31．63×10－3356．01．70×10－31．31×10－30．1281．02．77×10－32．69×10－3121．82．94×10－32．67×10－3244．72．17×10－32．00×10－3276．41．97×10－31．77×10－3302．91．84×10－31．52×10－3344．31．65×10－31．63×10－3356．01．61×10－31．31×10－30．1781．02．64×10－32．69×10－3121．82．82×10－32．67×10－3244．72．06×10－32．00×10－3276．41．87×10－31．77×10－3302．91．74×10－31．52×10－3344．31．57×10－31．63×10－3356．01．52×10－31．31×10－30．2281．02．53×10－32．69×10－3121．82．69×10－32．67×10－3244．71．96×10－32．00×10－3276．41．77×10－31．77×10－3302．91．65×10－31．52×10－3344．31．48×10－31．63×10－3356．01．44×10－31．31×10－330．22cm、1．00cmFig．3Simulationefficiencycomparedwiththeexperimentalefficiencyatadeadlayerof0．22cmandacold-fingersizeof1．00cm0．22cm、1．00cm152Eu133Ba15cm3．30．22cm、0．301cm1．00cm．HPGeMNCPHPGe．80keV6%XMCNP．5485MCNPγ．2．21．00cm．2Table2Efficiencyofsimulationresultsasafunctionofcold-fingersize/cm/keV3．5778．97．57×10－48．50×10－4964．16．47×10－47．35×10－41112．15．82×10－46．50×10－41408．04．91×10－45．31×10－42．5778．97．87×10－48．50×10－4964．16．76×10－47．35×10－41112．16．09×10－46．50×10－41408．05．21×10－45．31×10－41．5778．98．17×10－48．50×10－4964．17．06×10－47．35×10－41112．16．21×10－46．50×10－41408．05．26×10－45．31×10－41．0778．98．48×10－48．50×10－4964．17．29×10－47．35×10－41112．16．35×10－46．50×10－41408．05．30×10－45．31×10－44．20．22cm、0．301cm1．00cm4Fig．4Comparisonofsimulatedspectraandexperimentalspectra133Ba15cm4．40．22cm、0．301cm1．00cm．MCNPHPGe152Eu133Ba．．133Ba．1．M．1997472．2LIANGYong-feiWULi-pingBAILi-xinetal．AbouttheHPGeγSpectrometerShieldingProblemBasedonMCNPProgrammeJ．NuclearElectronics＆DetectionTechnology2003232182-186．．MCNPHPGeγJ．2003232182-186．3ErkinAbdulim．PrincipleUsageandMaintenanceofNewTypeofHigh-PurityGermaniumDetectorJ．JournalofXinjiangUniversity199714240-43．·．HPGe、J．199714240-43．4．M．1996119-126．5XUCui-huaWANGSi-guangZHOUQiangetal．ResearchontheAdjustmentofDetector’sDead-LayerThicknessandCold-FingerSizewithMonteCarloSimulationJ．ChineseJournalofRadiologicalHealth2003124203-204．．J．2003124203-204．64848