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1、DetectorDescription:SensitiveDetector&Fieldhttp://cern.ch/geant4PARTIII-Sensitivedetectors-Primitivescorers-Hits&digits-Read-outgeometry?AlogicalvolumebecomessensitiveifithasapointertoaconcreteclassderivedfromG4VSensitiveDetector?Asensitivedetectoreither?c
2、onstructsoneormorehitobjectsor?accumulatesvaluestoexistinghitsusinginformationgiveninaG4StepobjectNOTE:youmustgetthevolumeinformationfromthe“PreStepPoint”DetectorDescription:SensitiveDetector&Field-Geant4Course3?AG4VSensitiveDetectorobjectshouldbeassignedt
3、oG4LogicalVolume?IncaseasteptakesplaceinalogicalvolumethathasaSensitiveDetectorobject,theSensitiveDetectorisinvokedwiththecurrentG4Stepobject.?Eitherimplementdedicatedsensitivedetectorclasses,orusepredefinedscorersSteppingPhysicsParticleStepTrackLogical
4、SensitiveManagerProcessChangeVolumeDetectorGetPhysicalInteractionLengthSelectShortestDoItFillUpdateUpdateIsSensitiveGenerateHitsDetectorDescription:SensitiveDetector&Field-Geant4Course4?Tracklength?G4PSTrackLength,G4PSPassageTrackLength?Depositedenergy?G
5、4PSEnergyDepsit,G4PSDoseDeposit,G4PSChargeDeposit?Current/Flux?G4PSFlatSurfaceCurrent,G4PSSphereSurfaceCurrent,G4PSPassageCurrent,G4PSFlatSurfaceFlux,G4PSCellFlux,G4PSPassageCellFlux?Others:G4PSMinKinEAtGeneration,G4PSNofSecondary,G4PSNofStep,…angleL:Total
6、steplengthinthecell.V:VolumeDetectorDescription:SensitiveDetector&Field-Geant4Course5SensitivedetectorPrimitivescorer?Usermustimplementhis/herown?ManypredefinedscorersaredetectorandhitclassesprovidedinGeant4.Onecanaddhis?Onehitclasscancontainmanyownquantit
7、ies.Ahitcanbemadefor?Eachscoreraccumulatesaquantityeachindividualstep,oraccumulateforeacheventquantities?G4MultiFunctionalDetector?Basicallyonehitscollectionismadecreatesmanycollections(maps),peronedetectori.e.onecollectionperonescorer?Hitscollectionisrela
8、tivelycompact?KeysofmapsareredundantforscorersofsamevolumeDetectorDescription:SensitiveDetector&Field-Geant4Course6?Each“LogicalVolume”canhaveapointertoasensitivedetector?Hitisasnapshotofthephysicalinteractio
