SteppingAction.cc

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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// shall cite the following Geant4-DNA collaboration publication:
// Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
// 
// If you use this example, please cite the following publication:
// Rad. Prot. Dos. 133 (2009) 2-11

#include "G4SystemOfUnits.hh"
#include "G4SteppingManager.hh"

#include "SteppingAction.hh"
#include "RunAction.hh"
#include "DetectorConstruction.hh"
#include "Analysis.hh"

#include "G4Alpha.hh"
#include "G4Electron.hh"

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

SteppingAction::SteppingAction(RunAction* run,DetectorConstruction* det)
:fRun(run),fDetector(det)
{ }

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

SteppingAction::~SteppingAction()
{ }

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

void SteppingAction::UserSteppingAction(const G4Step* aStep)
  
{ 
  // Analysis manager
  
  G4AnalysisManager* man = G4AnalysisManager::Instance();

  // Read phantom - Singleton
   
  fMyCellParameterisation = CellParameterisation::Instance(); 

  //

  // Material : 1 is cytoplasm, 2 is nucleus

  G4int matVoxelPRE = -1;
  G4int matVoxelPOST = -1;
  G4int tmp=-1;
  
  tmp = aStep->GetPreStepPoint()->GetTouchableHandle()->GetReplicaNumber(); 
    
  if (tmp>0)  
  {
    matVoxelPRE =  fMyCellParameterisation->GetTissueType(tmp);
  }
  
  tmp = aStep->GetPostStepPoint()->GetTouchableHandle()->GetReplicaNumber();
  
  if (tmp>0) 
  {
    matVoxelPOST =  fMyCellParameterisation->GetTissueType(tmp);
  }
  
// COUNT GAS DETECTOR HITS

if (       ((aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalCollDetYoke())
        &&  (aStep->GetPostStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalIsobutane())
        &&  (aStep->GetTrack()->GetDynamicParticle()->GetDefinition() == G4Alpha::AlphaDefinition() ))
    
        || 
       ((aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalCollDetGap4())
        &&  (aStep->GetPostStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalIsobutane())
        &&  (aStep->GetTrack()->GetDynamicParticle()->GetDefinition() == G4Alpha::AlphaDefinition() ))

    ||

           ((aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalCollDetGap4())
        &&  (aStep->GetPostStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalIsobutane())
        &&  (aStep->GetTrack()->GetDynamicParticle()->GetDefinition() == G4Alpha::AlphaDefinition() ))

    )
    {
      fRun->AddNbOfHitsGas();   
    }
    
// STOPPING POWER AND BEAM SPOT SIZE AT CELL ENTRANCE

if (       ((aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalPolyprop())
        &&  (aStep->GetPostStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalKgm())
        &&  (aStep->GetTrack()->GetDynamicParticle()->GetDefinition() == G4Alpha::AlphaDefinition() ))
    
        || 
       ((aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalPolyprop())
        &&  (matVoxelPOST == 1)
        &&  (aStep->GetTrack()->GetDynamicParticle()->GetDefinition() == G4Alpha::AlphaDefinition() ))
    )
    {
    
     if( (aStep->GetPreStepPoint()->GetKineticEnergy() - aStep->GetPostStepPoint()->GetKineticEnergy() ) >0) 
     {
       //Fill ntupleid=1 
       man->FillNtupleDColumn(1,0,aStep->GetPreStepPoint()->GetKineticEnergy()/keV);
       man->FillNtupleDColumn(1,1,
                  (aStep->GetPreStepPoint()->GetKineticEnergy() -
                   aStep->GetPostStepPoint()->GetKineticEnergy())/
                  keV/(aStep->GetStepLength()/micrometer));
       man->AddNtupleRow(1);
     }

         // Average dE over step suggested by Michel Maire

     G4StepPoint* p1 = aStep->GetPreStepPoint();
         G4ThreeVector coord1 = p1->GetPosition();
         const G4AffineTransform transformation1 = p1->GetTouchable()->GetHistory()->GetTopTransform();
         G4ThreeVector localPosition1 = transformation1.TransformPoint(coord1);

     G4StepPoint* p2 = aStep->GetPostStepPoint();
         G4ThreeVector coord2 = p2->GetPosition();
         const G4AffineTransform transformation2 = p2->GetTouchable()->GetHistory()->GetTopTransform();
         G4ThreeVector localPosition2 = transformation2.TransformPoint(coord2);

         G4ThreeVector localPosition = localPosition1 + G4UniformRand()*(localPosition2-localPosition1);
     
     // end
     
     //Fill ntupleid=2
     man->FillNtupleDColumn(2,0,localPosition.x()/micrometer);
     man->FillNtupleDColumn(2,1,localPosition.y()/micrometer);
     man->AddNtupleRow(2);
    }

// ALPHA RANGE

if (

    (aStep->GetTrack()->GetDynamicParticle()->GetDefinition() == G4Alpha::AlphaDefinition())
    
    &&
    
    (aStep->GetTrack()->GetKineticEnergy()<1e-6)
    
    &&
            
          ( (matVoxelPOST==1)
    ||  (aStep->GetPostStepPoint()->GetTouchableHandle()->GetVolume()->GetLogicalVolume() == fDetector->GetLogicalKgm())    
    ||  (matVoxelPOST==2) ) 
        
   )
    
    {
       //Fill ntupleid=3
      man->FillNtupleDColumn(3,0,
                 aStep->GetPostStepPoint()->GetPosition().x()/micrometer);
      man->FillNtupleDColumn(3,1,
                 aStep->GetPostStepPoint()->GetPosition().y()/micrometer);
      man->FillNtupleDColumn(3,2,
                 aStep->GetPostStepPoint()->GetPosition().z()/micrometer);
      man->AddNtupleRow(3);
    }

// TOTAL DOSE DEPOSIT AND DOSE DEPOSIT WITHIN A PHANTOM VOXEL
// FOR ALL PARTICLES

if (matVoxelPRE  == 2)

    { 
     G4double dose = (aStep->GetTotalEnergyDeposit()/joule)/(fRun->GetMassNucleus()/kg);
     fRun->AddDoseN(dose);

     G4ThreeVector v;
         fRun->AddDoseBox(aStep->GetPreStepPoint()->GetTouchableHandle()->GetReplicaNumber(),
      aStep->GetTotalEnergyDeposit()/eV);
    }


if (matVoxelPRE  == 1)

    { 
     G4double dose = (aStep->GetTotalEnergyDeposit()/joule)/(fRun->GetMassCytoplasm()/kg);
     fRun->AddDoseC(dose);

     G4ThreeVector v;
         fRun->AddDoseBox(aStep->GetPreStepPoint()->GetTouchableHandle()->GetReplicaNumber(),
      aStep->GetTotalEnergyDeposit()/eV);
    }

// PROTECTION AGAINST MSC LOOPS FOR e-

if ( aStep->GetTotalEnergyDeposit()/MeV<1e-25
     && aStep->GetTrack()->GetDefinition()==G4Electron::ElectronDefinition()) 
{
  aStep->GetTrack()->SetTrackStatus(fStopAndKill);
  /*
  G4cout << "*** Warning *** : msc loop for " 
    << aStep->GetTrack()->GetDefinition()->GetParticleName() 
    << " in " << 
    aStep->GetPostStepPoint()->GetTouchableHandle()->GetVolume()->GetName() << G4endl;
  */
}

}