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// $Id: G4PhotoElectricEffect.icc,v 1.10 2002/04/18 10:12:01 maire Exp $
// GEANT4 tag $Name: geant4-06-00 $
//
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// 12-06-96, update by M.Maire
// 17-09-96, PartialSumSigma(i)
//           split ComputeBinbingEnergy(), M.Maire
// 08-01-97, crossection table + meanfreepath table , M.Maire
// 13-03-97, adapted for the new physics scheme, M.Maire
// 20-11-97, change for lowest energy limit default action
// 17-11-98, use table of atomic shells in PostStepDoIt, mma
// 06-01-99, use Sandia crossSection, V.Grichine mma
// 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
// 17-09-01, migration of Materials to pure STL (mma)  
// 10-01-02, moved few function from icc to cc
// 17-04-02, Keep only Sandia crossSections. Remove BuildPhysicsTables.
//           Simplify public interface (mma) 
  
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inline G4bool G4PhotoElectricEffect::IsApplicable(const G4ParticleDefinition&
                                                        particle)
{
   return ( &particle == G4Gamma::Gamma() ); 
}

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inline G4double G4PhotoElectricEffect::GetMeanFreePath(const G4Track& aTrack,
                                                       G4double,
                                                       G4ForceCondition*)

// returns the gamma mean free path in GEANT4 internal units
{
 G4double  GammaEnergy = aTrack.GetDynamicParticle()->GetKineticEnergy();
 G4double* SandiaCof   = aTrack.GetMaterial()->GetSandiaTable()
                                   ->GetSandiaCofForMaterial(GammaEnergy);
				    
 G4double energy2 = GammaEnergy*GammaEnergy, energy3 = GammaEnergy*energy2, 
          energy4 = energy2*energy2;

 
 G4double SIGMA = SandiaCof[0]/GammaEnergy + SandiaCof[1]/energy2 +
                  SandiaCof[2]/energy3     + SandiaCof[3]/energy4; 
          
 MeanFreePath = SIGMA > DBL_MIN ? 1./SIGMA : DBL_MAX;
 return MeanFreePath;
}

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