ICRP145_HumanPhantoms/src/TETSteppingAction.cc

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0025 //
0026 // TETSteppingAction.cc
0027 //
0028 // Author: Haegin Han
0029 // Reference: ICRP Publication 145. Ann. ICRP 49(3), 2020.
0030 // Geant4 Contributors: J. Allison and S. Guatelli
0031 //
0032
0033 #include "TETSteppingAction.hh"
0034
0035 TETSteppingAction::TETSteppingAction()
0036 : G4UserSteppingAction(), fKCarTolerance(1.0000000000000002e-07), fStepCounter(0),
0037   fCheckFlag(0)
0038 {}
0039
0040 void TETSteppingAction::UserSteppingAction(const G4Step* step)
0041 {
0042  // Slightly move the particle when the step length of five continuous steps is
0043  // shorter than the tolerance (0.1 nm)
0044  //
0045  G4Track* theTrack = step->GetTrack();
0046  G4bool CheckingLength = (step->GetStepLength() < fKCarTolerance);
0047  if(CheckingLength)
0048  {
0049   ++fStepCounter;
0050   if( fCheckFlag && fStepCounter>=5 )
0051   {
0052    // kill the track if the particle is stuck even after the slight move
0053    // (this hardly occurs)
0054    theTrack->SetTrackStatus(fStopAndKill);
0055    fStepCounter=0;
0056    fCheckFlag=0;
0057 }
0058  else if(fStepCounter>=5 )
0059   {
0060    // if a particle is at the same position (step length < 0.1 nm) for five consecutive steps,
0061    // slightly move (0.1 nm) the stuck particle in the direction of momentum
0062    theTrack->SetPosition(theTrack->GetPosition() + theTrack->GetMomentumDirection()*fKCarTolerance);
0063    fCheckFlag=1;
0064   }
0065  }
0066 else fStepCounter=0;
0067 }