Gabriele Cosmo
158 lines
5.9 KiB
Plaintext
158 lines
5.9 KiB
Plaintext
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4GammaConversion.icc,v 1.7 2001/09/17 17:07:11 maire Exp $
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// GEANT4 tag $Name: geant4-05-02-patch-01 $
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//
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//
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// ------------ G4GammaConversion physics process -------------------------
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// by Michel Maire, 24 May 1996
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//
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// 11-06-96, in GetMeanFreePath() the partial sum is stored, by M.Maire
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// 16-09-96, dynamical array PartialSumSigma, by M.Maire
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// 13-12-96, Sign corrected in the ScreenFunctions, by L.Urban
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// 14-01-97, crossection table + meanfreepath table.
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// PartialSumSigma removed, by M.Maire
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// 14-01-97, new physics scheme for geant4alpha, M.Maire
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// 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
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// 17-09-01, migration of Materials to pure STL (mma)
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// -----------------------------------------------------------------------------
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4bool G4GammaConversion::IsApplicable(
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const G4ParticleDefinition& particle)
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{
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return ( &particle == G4Gamma::Gamma() );
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion::GetCrossSectionPerAtom(
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const G4DynamicParticle* aDynamicGamma,
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G4Element* anElement)
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// gives the total cross section per atom in GEANT4 internal units
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{
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G4double crossSection;
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G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
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G4bool isOutRange ;
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if (GammaEnergy < LowestEnergyLimit)
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crossSection = 0. ;
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else {
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if (GammaEnergy > HighestEnergyLimit) GammaEnergy=0.99*HighestEnergyLimit;
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crossSection = (*theCrossSectionTable)(anElement->GetIndex())->
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GetValue( GammaEnergy, isOutRange );
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}
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return crossSection;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion::GetMeanFreePath(const G4Track& aTrack,
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G4double,
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G4ForceCondition*)
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// returns the photon mean free path in GEANT4 internal units
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// (MeanFreePath is a private member of the class)
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{
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const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
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G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
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G4Material* aMaterial = aTrack.GetMaterial();
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G4bool isOutRange;
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if (GammaEnergy < LowestEnergyLimit)
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MeanFreePath = DBL_MAX;
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else {
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if (GammaEnergy > HighestEnergyLimit) GammaEnergy=0.99*HighestEnergyLimit;
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MeanFreePath = (*theMeanFreePathTable)(aMaterial->GetIndex())->
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GetValue( GammaEnergy, isOutRange );
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}
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return MeanFreePath;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion::ComputeMeanFreePath(G4double GammaEnergy,
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G4Material* aMaterial)
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// computes and returns the photon mean free path in GEANT4 internal units
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{
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const G4ElementVector* theElementVector = aMaterial->GetElementVector();
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const G4double* NbOfAtomsPerVolume = aMaterial->GetVecNbOfAtomsPerVolume();
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G4double SIGMA = 0 ;
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for ( size_t i=0 ; i < aMaterial->GetNumberOfElements() ; i++ )
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{
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SIGMA += NbOfAtomsPerVolume[i] *
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ComputeCrossSectionPerAtom(GammaEnergy,
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(*theElementVector)[i]->GetZ());
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}
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return SIGMA > DBL_MIN ? 1./SIGMA : DBL_MAX;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion::ScreenFunction1(G4double ScreenVariable)
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// compute the value of the screening function 3*PHI1 - PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*log(ScreenVariable+0.952);
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else
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screenVal = 42.392 - ScreenVariable*(7.796 - 1.961*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion::ScreenFunction2(G4double ScreenVariable)
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// compute the value of the screening function 1.5*PHI1 - 0.5*PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*log(ScreenVariable+0.952);
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else
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screenVal = 41.405 - ScreenVariable*(5.828 - 0.8945*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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