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Question Simulating and calculating Geometric Factors in GEANT4 

Forum: Space Applications
Date: 26 Jun, 2012
From: Bruno Morgado <Bruno Morgado>

Hello,
I'm trying to calculate the "real" Geometric Factor (GF) of an instrument in Geant, but I'm having some problems with the results.

My macro file is:
# Set GPS spherical source
/gps/particle e-			# particle type
/gps/pos/type Surface
/gps/pos/shape Sphere
/gps/centre 0 0 0 m			# source centre
/gps/pos/radius 10 cm
/gps/ang/type cos
/gps/ene/mono 52. keV
/run/beamOn 200000000

And I finish calculating the GF with:
double geometryFactor(double numberDetectedParticles, double numberEmitedParticles, const double sourceRadius) {
    return ((8 * numberDetectedParticles * pow(TMath::Pi(), 2) * pow(sourceRadius, 2)) / numberEmitedParticles);
}

Still, like I said the results don't seem to add up. Can you direct me to some place where I can check if these are the correct calculations or if there is some mistake?

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1 Idea: Re: Simulating and calculating Geometric Factors in GEANT4   (Laurent Desorgher - 02 Oct, 2012)
(_ None: Re: Simulating and calculating Geometric Factors in GEANT4   (Bruno Morgado - 08 Oct, 2012)
(_ None: Re: Simulating and calculating Geometric Factors in GEANT4   (Laurent Desorgher - 08 Oct, 2012)
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