// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4LowEnergyGammaConversion.icc,v 1.9 2000/06/22 02:25:25 pia Exp $
// GEANT4 tag $Name: geant4-02-00 $
//
// 
// ---------------------------------------------------------------
//      GEANT 4 class inlined methods file
//
//      For information related to this code contact:
//      CERN, CN Division, ASD group
//      ------------ G4LowEnergyGammaConversion physics process ---------
//                   by A.Forti 1999/03/02
// ***************************************************************

inline G4bool G4LowEnergyGammaConversion::IsApplicable(const G4ParticleDefinition& particle)
{
   return ( &particle == G4Gamma::Gamma() ); 
}

inline G4double 
G4LowEnergyGammaConversion::GetMeanFreePath(const G4Track& aTrack, G4double, G4ForceCondition*){

  // returns the gamma mean free path in GEANT4 internal units
  const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
  G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
  G4Material* aMaterial = aTrack.GetMaterial();

  G4bool isOutRange ;
  
  if (GammaEnergy < LowestEnergyLimit){
    MeanFreePath = DBL_MAX;

  }
  else {
    if(GammaEnergy > HighestEnergyLimit) GammaEnergy = 0.99*HighestEnergyLimit;   
    MeanFreePath = util.DataLogInterpolation(GammaEnergy, aMaterial->GetIndex(), theMeanFreePathTable);	

  }                                     
  
  return MeanFreePath;
}

inline G4double 
G4LowEnergyGammaConversion::ScreenFunction1(G4double ScreenVariable)

// compute the value of the screening function 3*PHI1 - PHI2

{
   G4double screenVal;

   if (ScreenVariable > 1.)
     screenVal = 42.24 - 8.368*log(ScreenVariable+0.952);
   else
     screenVal = 42.392 - ScreenVariable* (7.796 - 1.961*ScreenVariable);

   return screenVal;
} 

inline G4double 
G4LowEnergyGammaConversion::ScreenFunction2(G4double ScreenVariable)

// compute the value of the screening function 1.5*PHI1 - 0.5*PHI2
{
   G4double screenVal;

   if (ScreenVariable > 1.)
     screenVal = 42.24 - 8.368*log(ScreenVariable+0.952);
   else
     screenVal = 41.405 - ScreenVariable* (5.828 - 0.8945*ScreenVariable);

   return screenVal;
} 



