核动力堆安全壳内外中子能谱和剂量测量

382Vol.38,No.220043AtomicEnergyScienceandTechnologyMar.2004(,102413):,3He;,MCNP,MIEKEB,,,:;3He;;;:O571154:A:100026931(2004)0220131206MeasurementsofNeutronSpectraandDosesInsideandOutsidetheContainmentofaPowerReactorCHENJun(ChinaInstituteofAtomicEnergy,P.O.Box275220,Beijing102413,China)Abstract:Theneutronspectraandtheneutrondoseequivalentratesinsideandoutsidethecontainmentofapowerreactorweremeasuredwithtwomulti2spherespectrometersystemsthatthecentraldetectorsareasphericalgoldfoilandaspherical3Heproportionalcounter,re2spectively.TheresponsefunctionswerecalculatedbyMCNPcode,andMIEKEBcodewasusedforunfolding.Someexperimentsweredoneinordertoverifytheaccuracyofthecalcu2latedresponsefunctionsofthesesystems.Themeasuredresultswerecomparedwiththecal2culatedresults.Itisshownthattheyareaccordantintheiruncertainties.Keywords:multi2spherespectrometer;spherical3Heproportionalcounter;sphericalgoldfoil;neutronspectrum;neutrondoseequivalentrate:2003205223;:2003209215:(1971),,,,,,,,,,,1©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(3He10BF36LiI(Eu))1),,,,,,,,,;,,,,(1)1Fig.1Distributionofresponsefunctionsofmulti2spherespectrometer2),n,jEj(E),(E),jNj:Nj=0(E)j(E)dEj=1,2,3,,nj(Ei),,:Nj=i(Ei)j(Ei)Eij=1,2,3,,n,(Ei),Monte2Carlo(MCNP)j(Ei)2,,,,MCNP,3He,2112119,,x,y,z13He,2345(),68(),70192g/cm3,9,,,z,z,10meV15185MeV,47,,,3He[1]212dBonner,En,,Rd(En)=Md(En),,Md,(En)BonnerVc13He(n,p)3HMd,,j1KVc1Kklk(Ej),Ej(Ej-1,Ej],,K,lk,j3HeEj-1Ej,:Rd(En)=jjasnHeVc1n,p(Ej)(1):s;nHe3He;Vc1;n,p(Ej)23138©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1)(11)Ej(Ej-1,Ej]3He(n,p)3H,C=asVc1nHe,,jnHe,Monte2Carlo,,,C=-asVcl,C=-aVc1C=asVc1nHe3213uc(R)=s(R)Rs(Rd(En))Rd(En),,s(Rd(En)),(1),,s(Rd(En))MC2NPRd(En)Monte2Carlo,,,3MIEKEB,3Fig.3Responsefunctionsofmulti2spherespectrometersa3He,215331545681012;b,3315456810Monte2Carlo,[2]4,1)3He252Cf241Am2Be4,5[3][3],12)250630keV,3He,,MCNP,(2)3312:©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(a)252Cf(b)Fig.4Measuredneutronspectraof241Am2Be(a)and252Cf(b)neutronsources;5241Am2Be(a)252Cf(b)[3]Fig.5Standardneutronspectraof241Am2Be(a)and252Cf(b)neutronsources[3]1252Cf241Am2BeTable1Neutrondoseequivalentratesof241Am2Beand252Cfneutronsources/s-1/cm/(Svh-1)/241Am2Be2170107120210212019906252Cf6.981071403933731.05362250630keVTable2Comparisonofresponsesoftwomulti2spherespectrometersystemsat250and630keV/keV/cmRexp/cm2Rcal/cm2A=Rexp,3He/Rexp,AuB=Rcal,3He/Rcal,AuA/B2503He100141187215205010175501490(51276)(51143)110266303He10031195213681000152701467610635107111196:100cm43138©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)HPGe()()HPGe,HPGe34176Bq,381106Bq,010912,3He11,7(6)3()4(),,,35:1);2);3);4),HPGe[4],56,()(PTB3%),10%,,6Fig.6Measuredneutronspectainsideandoutsidethecontainmenta(1);b(5);c(3);d(4)5312:©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(Svh-1)(1)618710-2(2)613010-2(3)217510-2(4)210710-1(5)111110-1310-21110-21)(6)114311176(7)111061124(8)312910-2(9)117510-2(10)111810-2(11)816710-3011710-22):1)(1)(5)2)(8)(11)10%4Table4Neutrondoseequivalentratesinsidethecontainment/(Svh-1)(1)91030(2)11043(3)81525(4)81247(5)721781(6)91941(7)151049:15Table5Uncertaintyanalysisofthemeasuredneutrondoseequivalentratesinsideandoutsidethecontainment/%[4]Monte2Carlo2010AA11[1]10[1]BB3He1[1]B15[5]15[5]BB210230AA310AA(HPGe)2B28301)24381):1):[1]WiegelB,AlevraAV,SiebertBRL.CalculationsoftheResponseFunctionsofBonnerSpheresWithaSpherical3HeProportionalCounterUsingaReal2isticDetectorModel:PTB2N221[R].Braun2schweig,Germany:Physikalisch2Technische2Bun2desanstalt,1994.[2]MatzkeM.UnfoldingofPulseHeightSpectraTheHEPROProgramSystem:PTB2N219[R].Braunschweig,Germany:Physikalisch2Technische2Bundesanstalt,1994.[3]ISO852923(1989),NeutronReferenceRadiation2Part3CalibrationofAreaandPersonalDosimetersandDeterminationofResponseasaFunctionofEnergyandAngleofIncidence[S].[4]ISO1993(E),GuidetoExpressionofUncertaintyinMeasurement[S].[5]MatzkeM.PropagationofUncertaintiesinUnfold2ingProcedures:PTB2S7201[R].Braunschweig,Germany:Physikalisch2Technische2Bundesanstalt,1994.63138©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.