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// $Id: G4CrossSectionIonisationBornElectron.cc,v 1.2 2007/11/08 18:51:34 pia Exp $
// GEANT4 tag $Name: geant4-09-04-beta-cand-01 $
// 
// Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
//
// Reference: TNS Geant4-DNA paper
// Reference for implementation model: NIM. 155, pp. 145-156, 1978

// History:
// -----------
// Date         Name              Modification
// 28 Apr 2007  M.G. Pia          Created in compliance with design described in TNS paper
//
// -------------------------------------------------------------------

// Class description:
// Geant4-DNA Cross total cross section for electron elastic scattering in water
// Reference: TNS Geant4-DNA paper
// S. Chauvie et al., Geant4 physics processes for microdosimetry simulation:
// design foundation and implementation of the first set of models,
// IEEE Trans. Nucl. Sci., vol. 54, no. 6, Dec. 2007.
// Further documentation available from http://www.ge.infn.it/geant4/dna

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


#include "G4CrossSectionIonisationBornElectron.hh"
#include "G4Track.hh"
#include "G4DynamicParticle.hh"
#include "G4ParticleDefinition.hh"
#include "G4Electron.hh"
#include "G4LogLogInterpolation.hh"

#include "Randomize.hh"

G4CrossSectionIonisationBornElectron::G4CrossSectionIonisationBornElectron()
{

  // ---- MGP ---- Limits to be checked: current values are just temporary for testing purpose
  lowEnergyLimit = 7.4 * eV;
  highEnergyLimit = 10 * keV;

  table = 0;
}


G4CrossSectionIonisationBornElectron::~G4CrossSectionIonisationBornElectron()
{
  delete table;
}
 
G4double G4CrossSectionIonisationBornElectron::CrossSection(const G4Track& track)
{
  // Lazy initialisation: load cross section tables in memory the first time access to them is required
  
  G4double sigma = 0.;

  if (table == 0)
    {
      // Load tables
      // ---- MGP ---- 
      table = new G4DNACrossSectionDataSet(new G4LogLogInterpolation, eV,(1e-22/3.343)*m*m );
      table->LoadData("dna/sigma_ionisation_e_born");
      
      // ---- MGP ---- Temporary
      table->PrintData();
    }

  const G4DynamicParticle* particle = track.GetDynamicParticle();
  G4double k = particle->GetKineticEnergy();

  if (k > lowEnergyLimit && k < highEnergyLimit)
    { 
      sigma = table->FindValue(k); // no electron interaction ---- MGP ---- What does this mean?
    }
  return sigma;
}


