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Question why the simulated efficiency is 5tilmes higher 

Forum: Particles
Date: 26 Oct, 2011
From: Dziri <Dziri>

Hello, I ve simulated the cobalt-60 source using gps and particulegun, and the result is the same. However, the efficiency is 5 times higher than the experimental one.

here is how I declared the part of the detector where the photon will interact.

void bege_planSteppingAction::UserSteppingAction(const G4Step* aStep) {

if((aStep->GetTrack()->GetDynamicParticle()->GetDefinition()->GetParticleName()!="photon")  && (aStep->GetTrack()->GetVolume()->GetName() == "Cristal_P") && aStep -> GetPostStepPoint() -> 
	    GetProcessDefinedStep()-> GetProcessName()!= " Transportation "){

      eventaction->AddEdep(aStep->GetTotalEnergyDeposit()); 
}
Does any one has an idea why this factor 5.
where can I take a look to overcome this problem.

Here is attached a figure of my simulation in green (geant4, blue, MCNPX and red experiment)

thank you for your help cheers

Samir

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/10/26/08.14-43423-Cobalt_60.jpg

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1 Feedback: Re: why the simulated efficiency is 5tilmes higher   (Gumplinger Peter - 26 Oct, 2011)
(_ None: Re: why the simulated efficiency is 5tilmes higher   (Dziri - 27 Oct, 2011)
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