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1、復(fù)旦大學(xué)博士學(xué)位論文裂變材料及相關(guān)核裝置的無損探測與識別姓名:田東風(fēng)申請學(xué)位級別:博士專業(yè):核物理指導(dǎo)教師:楊福家霍裕昆2000.4.1復(fù)旦大學(xué)博士學(xué)位論文ABSTRACTThisworkisdevotedtostudythephysicalfeasibilityofnondestmctivelydetectingandidentifyingfissilematerialorrelatednucleardeviceThekeypoint
2、ofthetechniqueiStoextracttheusefulinformationofnuclearfissilematerialstObemeasuredandnucleardeviceconcernedbasingonthemeasuredcharacteristicYradiationemittedspontaneouslyfromthenuclearfissilematerialItisindicatedbythisst
3、udythatthegeometricselfshieldingcorrection(theyrayselfabsorption)ofthemeasuredfissilematerialsisoneofthekeyfactorstoimprovetheaccuracyofthecalculationsWepresentasimplifiedsemi—empiricalexpressionsfortheselfshieldingcorre
4、ctionfactorsofsomesimplegeometricconfigurationsAndanewmethodisalsodiscussedandproposedtodirectlyextractthepurelyoriginalinformationofthegeometricselfabsorptioncorrectionthroughthemeasuredcharacteristicYradiationemittedsp
5、ontaneouslyfromnuclearfissilematerialThenumericalsimulationtestsshowthatthismethodcanextractthepurelyoriginalinformationneededfornondestructiveassaymethodbytheyrayspectratobemeasured,eventhoughthegeometricshapeofthesampl
6、eandmaterialsbetweensampleanddetectorarenotknowninadvanceByusingsimulatedyspectradatacalculatedbyMCNPcode,thesemethodsaretestedandtheresultsshowthattheisotopiccompositionandsomeothercharacteristicinformationcanbeextracte
7、dfromthemeasured7rayspectrumoffissilematerialswithaccuracybetterthan2%Thesemethodsdiscussedinthispapercanbeappliedtothenuclearmaterialsafeguardtechniquessuchasmonitor,verifyingandaccountetcSincethenuclearmaterialsemitneu
8、tronsaswellasyrays,andtheneutronemissionrateforsomeisotopesishighenoughtoprovidetheusefulandeasilymeasurableinformationThesemeasuredinformationalSOcanbeusedtoobtainquantitativeassaysofaparticularisotopeifthesample’Sisoto
9、piccompositionisknownandonlyafewisotopesarepresentAlthoughthediscussionforsuchtechniqueisnotemphasizedinpresentpaper,oneexampleofitsapplication,theneutronreflectioneffectonthetotalabsorptiondetectormethodwhichwasusedtome
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