Gabriele Cosmo
144 lines
5.5 KiB
Plaintext
144 lines
5.5 KiB
Plaintext
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4VDNAProcessInWater.icc,v 1.4 2006/06/29 19:37:05 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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#ifdef G4VDNAPROCESSINWATER_HH
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template<typename TotalCrossSectionPolicy, typename FinalStatesPolicy>
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G4VParticleChange * G4VDNAProcessInWater<TotalCrossSectionPolicy, FinalStatesPolicy> :: PostStepDoIt(const G4Track & aTrack, const G4Step & aStep)
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{
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ValidateInWater(aTrack);
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G4double k=aTrack.GetDynamicParticle()->GetKineticEnergy();
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if (FinalStatesPolicy::KillIncomingParticle(k))
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{
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G4int n(aParticleChange.GetNumberOfSecondaries());
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while (n>0)
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{
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n--;
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delete aParticleChange.GetSecondary(n);
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}
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aParticleChange.Clear();
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aParticleChange.Initialize(aTrack);
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aParticleChange.ProposeLocalEnergyDeposit(k);
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aParticleChange.ProposeTrackStatus(fStopAndKill);
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aParticleChange.ProposeEnergy(0.);
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}
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return G4VLowEnergyTestableDiscreteProcess::PostStepDoIt(aTrack, aStep);
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}
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template<typename TotalCrossSectionPolicy, typename FinalStatesPolicy>
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void G4VDNAProcessInWater<TotalCrossSectionPolicy, FinalStatesPolicy> :: BuildPhysicsTable(const G4ParticleDefinition & /* aParticleDefinition */)
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{
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TotalCrossSectionPolicy::BuildTotalCrossSection();
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FinalStatesPolicy::BuildFinalStatesData();
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}
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template<typename TotalCrossSectionPolicy, typename FinalStatesPolicy>
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G4bool G4VDNAProcessInWater<TotalCrossSectionPolicy, FinalStatesPolicy> :: IsApplicable(const G4ParticleDefinition & aParticleDefinition)
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{
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return (&aParticleDefinition)==TotalCrossSectionPolicy::IncomingParticleDefinition();
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}
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template<typename TotalCrossSectionPolicy, typename FinalStatesPolicy>
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void G4VDNAProcessInWater<TotalCrossSectionPolicy, FinalStatesPolicy> :: ValidateInWater(const G4Track & aTrack) const
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{
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G4Material * theMaterial(aTrack.GetMaterial());
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// Water validation consists in checking that density is 1. and that Oxigen and Hydrogen are the only two elements of the material
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if (std::fabs(theMaterial->GetDensity()*cm3/g-1.)<0.1)
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if (theMaterial->GetNumberOfElements()==2)
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{
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const G4Element * element1(theMaterial->GetElement(0));
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const G4Element * element2(theMaterial->GetElement(1));
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if ((element1->GetZ()==1. && element2->GetZ()==8.) ||
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(element1->GetZ()==8. && element2->GetZ()==1.))
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return;
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}
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G4String message;
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message="G4VDNAProcessInWater::ValidateInWater - Process ";
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message+=GetProcessName();
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message+=" happened in material ";
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message+=theMaterial->GetName();
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G4Exception(message);
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}
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template<typename TotalCrossSectionPolicy, typename FinalStatesPolicy>
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G4double G4VDNAProcessInWater<TotalCrossSectionPolicy, FinalStatesPolicy> :: GetMeanFreePath(const G4Track & aTrack, G4double /* previousStepSize */, G4ForceCondition * /* condition */)
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{
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const G4int z(10); // H2O number of electrons
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G4double k=aTrack.GetDynamicParticle()->GetKineticEnergy();
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// We suppose we are in water, one of the elements must be oxygen
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G4Material * theMaterial(aTrack.GetMaterial());
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size_t i(theMaterial->GetNumberOfElements());
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while (i>0)
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{
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i--;
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const G4Element * element(theMaterial->GetElement(i));
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if (element->GetZ()==8.)
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{
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// Number of oxigens per volume = number of water molecules per volume
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G4double density;
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density=theMaterial->GetAtomicNumDensityVector()[i];
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if (density<=0.)
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return DBL_MAX;
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G4double sigma_el;
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sigma_el=TotalCrossSectionPolicy::TotalCrossSection(k, z);
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if (sigma_el<=0.)
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return DBL_MAX;
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return 1./(density*sigma_el);
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}
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}
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G4String message;
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message="G4VDNAProcessInWater::GetMeanFreePath - ";
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message+=theMaterial->GetName();
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message+=" is not a water material";
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G4Exception(message);
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return DBL_MAX;
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}
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#endif /* G4VDNAPROCESSINWATER_HH */
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