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// $Id: G4PEEffectModel.hh,v 1.7 2009/02/20 12:06:37 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4PEEffectModel
//
// Author:        Vladimir Ivanchenko on base of Michel Maire code
//
// Creation date: 21.04.2005
//
// Modifications:
//
// 06.02.2006 : added ComputeMeanFreePath()  (mma)
// 20.02.2009 : move virtual inline to .cc, substitute
//              ComputeMeanFreePath() by CrossSectionPerVolume (VI)
//
// Class Description:
//
// Implementation of the photo-electric effect
//

// -------------------------------------------------------------------
//

#ifndef G4PEEffectModel_h
#define G4PEEffectModel_h 1

#include "G4VEmModel.hh"
#include "G4PhysicsTable.hh"

class G4ParticleChangeForGamma;

class G4PEEffectModel : public G4VEmModel
{

public:

  G4PEEffectModel(const G4ParticleDefinition* p = 0,
		  const G4String& nam = "PhotoElectric");

  virtual ~G4PEEffectModel();

  virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);

  virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
					      G4double kinEnergy,
					      G4double Z,
					      G4double A,
					      G4double, G4double);
				      
  virtual G4double CrossSectionPerVolume(const G4Material*,
					 const G4ParticleDefinition*,
					 G4double kineticEnergy,
					 G4double cutEnergy,
					 G4double maxEnergy);

  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
				 const G4MaterialCutsCouple*,
				 const G4DynamicParticle*,
				 G4double tmin,
				 G4double maxEnergy);
protected:

  virtual G4double ElecCosThetaDistribution(G4double ElecKineEnergy);

private:

  G4ParticleDefinition*     theGamma;
  G4ParticleDefinition*     theElectron;
  G4ParticleChangeForGamma* fParticleChange;

  G4double                  fminimalEnergy;
  G4bool                    isInitialized;
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#endif