Optical Readout for Imaging Neutron Scintillation Detectors.pdf

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1、OpticalReadoutforImagingNeutronScintillationDetectorsDonaldP.Hutchinson,RogerK.Richards,L.CurtMaxey,R.G.Cooper,andDavidE.HolcombEngineeringScienceandTechnologyDivisionOakRidgeNationalLaboratoryBethelValleyRoad,OakRidge,TN37831AbstractTheSpallationNeutronSource(SNS)underconstructionattheOakRidge

2、NationalLaboratory(ORNL)willbethemostimportantnewneutronscatteringfacilityintheUnitedStates.NeutronscatteringinstrumentsfortheSNSwillrequirelargeareadetectorswithfastresponse(<1microsecond),highefficiencyoverawiderangeofneutronenergies(0.1to10eV),andlowgammaraysensitivity.Wearecurrently6develop

3、ingareaneutrondetectorsbasedonacombinationofaLiF/ZnS(Ag)scintillatorscreencoupledtoawavelength-shiftingfiberopticreadoutarray.A25x25cmprototypedetectoriscurrentlyunderdevelopment.InitialtestsattheIntensePulsedNeutronSourceattheArgonneNationalLaboratoryhavedemonstratedgoodimagingpropertiescouple

4、dwithverylowgammaraysensitivity.Theresponsetimeofthisdetectorisapproximately1microsecond.Detailsofthedesignandtestresultsofthedetectorwillbepresented.PositionSensitiveDetectorAprototype25x25-cmpositionsensitivedetectorhasbeendesignedandconstructed.6Thedetectorusesascintillatorscreenfabricatedfr

5、omamixtureofLiF/ZnS(Ag)powdersheldinanepoxymatrixAphotographofthedetectorandfiberopticsreadoutarrayisshowninFigure1.Theneutronscintillatorscreen,fiberopticsreadoutandphotomultipliertubesaremountedinanaluminumlight-tightenclosure.Neutronsenterthedetectorthrougha0.125-inchthickcoverplate.Anarrayo

6、fwavelength-shiftingfibersisclampedonthescreenoppositethecoverplateina2-dimensionalarraywith48fibersineachdirection.OneendofeveryfiberismappedontoanindividualFigure1ScintillatorScreenandFiberReadoutArraycathodeofaPhilips262AdvancesinNeutronScatteringInstrumentation,IanS.Anderson,BrunoGuérard,Ed

7、itors,ProceedingsofSPIEVol.4785(2002)©2002SPIE·0277-786X/02/$15.00DownloadedfromSPIEDigitalLibraryon17Mar2011to211.68.3.254.TermsofUse:http://spiedl.org/termsXP1704multi-anodephotomultipliertube.Thistubecontains96individualanodesi