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,const 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;

  const G4StepPoint* preStep = aStep->GetPreStepPoint();
  const G4StepPoint* postStep = aStep->GetPostStepPoint();
  const G4Track* track = aStep->GetTrack();

  const G4LogicalVolume* preVolume =
    preStep->GetPhysicalVolume()->GetLogicalVolume();

  const G4LogicalVolume* postVolume = nullptr;
  if(postStep->GetPhysicalVolume()) 
  {
    postVolume = postStep->GetPhysicalVolume()->GetLogicalVolume();
  }
  const G4ParticleDefinition* particle = 
    track->GetDynamicParticle()->GetDefinition();

  G4int preReplicaNumber = preStep->GetTouchableHandle()->GetReplicaNumber(); 
  G4double edep = aStep->GetTotalEnergyDeposit();
    
  if (preReplicaNumber>0)  
  {
    matVoxelPRE =  fMyCellParameterisation->GetTissueType(preReplicaNumber);
  }

  if(postVolume) 
  {
    G4int postReplicaNumber = postStep->GetTouchableHandle()->GetReplicaNumber();
    if (postReplicaNumber>0) 
    {
      matVoxelPOST = fMyCellParameterisation->GetTissueType(postReplicaNumber);
    }
  }
  
  // COUNT GAS DETECTOR HITS

  if (particle == G4Alpha::AlphaDefinition()) 
  { 
    if(postVolume == fDetector->GetLogicalIsobutane() &&
       ((preVolume == fDetector->GetLogicalCollDetYoke())
  || 
  (preVolume == fDetector->GetLogicalCollDetGap4())
  ||
  (preVolume == fDetector->GetLogicalCollDetGap4())))
    {
      fRun->AddNbOfHitsGas(); 
    }
  
    // STOPPING POWER AND BEAM SPOT SIZE AT CELL ENTRANCE
    if(preVolume == fDetector->GetLogicalPolyprop() &&
       ( (postVolume == fDetector->GetLogicalKgm()) || 
   (matVoxelPOST == 1)) )
    { 
      G4double deltaE = preStep->GetKineticEnergy() 
  - postStep->GetKineticEnergy();
      if(deltaE > 0.0) 
      {
  //Fill ntupleid=1 
  man->FillNtupleDColumn(1,0,preStep->GetKineticEnergy()/keV);
  man->FillNtupleDColumn(1,1,deltaE*micrometer/(keV*aStep->GetStepLength()));
  man->AddNtupleRow(1);
      }

      // Average dE over step suggested by Michel Maire
      G4ThreeVector coord1 = preStep->GetPosition();
      const G4AffineTransform transformation1 = 
  preStep->GetTouchable()->GetHistory()->GetTopTransform();
      G4ThreeVector localPosition1 = transformation1.TransformPoint(coord1);

      G4ThreeVector coord2 = postStep->GetPosition();
      const G4AffineTransform transformation2 = 
  postStep->GetTouchable()->GetHistory()->GetTopTransform();
      G4ThreeVector localPosition2 = transformation2.TransformPoint(coord2);

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

    // ALPHA RANGE
    if (postStep->GetKineticEnergy() < eV && 
  ( (matVoxelPOST==1) ||
    (postVolume == fDetector->GetLogicalKgm()) || 
    (matVoxelPOST==2) ) )
    {
      //Fill ntupleid=3
      man->FillNtupleDColumn(3,0,postStep->GetPosition().x()/micrometer);
      man->FillNtupleDColumn(3,1,postStep->GetPosition().y()/micrometer);
      man->FillNtupleDColumn(3,2,postStep->GetPosition().z()/micrometer);
      man->AddNtupleRow(3);
    }
    
    // TOTAL DOSE DEPOSIT AND DOSE DEPOSIT WITHIN A PHANTOM VOXEL
    // FOR ALL PARTICLES
  }

  if (matVoxelPRE  == 2)
  { 
    G4double dose = (edep/joule)/(fRun->GetMassNucleus()/kg);
    fRun->AddDoseN(dose);
    fRun->AddDoseBox(preReplicaNumber, edep/eV);
  }
  else if (matVoxelPRE  == 1)
  { 
    G4double dose = (edep/joule)/(fRun->GetMassCytoplasm()/kg);
    fRun->AddDoseC(dose);
    fRun->AddDoseBox(preReplicaNumber, edep/eV);
  }

  // PROTECTION AGAINST POSSIBLE MSC LOOPS FOR e-

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