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Forum: Event and Track Management
Re: Question Energy Leakage (AJ Richards)
Date: 29 Apr, 2010
From: michel maire <michel maire>

On Thu, 29 Apr 2010 15:22:34 GMT, AJ Richards wrote:
> Hi,
>   I am trying to measure the energy deposited in a layer of diamond by incident
> particles (protons, pions, and betas).  I am currently using
> getTotalEnergyDeposit(), but I am worried about the following scenario:  What if
> some of the secondary particles escape the sensitive detector region?  I only
> want to include the energy deposited within the diamond region, not the energy
> that escapes via the original particle or the secondaries.  Is
> getTotalEnergyDeposit() the right tool for the job?  Or will this include the
> energy escaping via the secondaries?  Thanks.  -AJ
> 

 I recopy below example/novice/N03 SteppingAction.

 void ExN03SteppingAction::UserSteppingAction(const G4Step* aStep)
 {
  // get volume of the current step
  G4VPhysicalVolume* volume 
  = aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume();

  // collect energy and track length step by step
  G4double edep = aStep->GetTotalEnergyDeposit();

  G4double stepl = 0.;
  if (aStep->GetTrack()->GetDefinition()->GetPDGCharge() != 0.)
    stepl = aStep->GetStepLength();

  if (volume == detector->GetAbsorber()) eventaction->AddAbs(edep,stepl);
  if (volume == detector->GetGap())      eventaction->AddGap(edep,stepl);
 }

 See also following attachment.

  Cheers,   Michel   

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/04/29/11.03-45148-StepAction2.faq.txt

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