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Keywords: angle solid
Forum: Particles
Re: None ParticleGun (Ibrahim)
Date: 22 Oct, 2007
From: michel maire <michel maire>

User Adam wrote:

>> Hi,
>> 
>> how can i define a solid angle in geant4. I' d like to send the gammas
>> in this angle solid into my cyliderical detector. The radius of cylinder
>> is 3.81 cm and the distance between the gamma source and the detector is
>> 4 cm .

 1 - See extended/electromagnetic/TestEm4/PrimaryGenerator.cc

 2 - Efficiency calculation : you must count only primary particles (ID=1)
     which interact in NaI. In SteppingAction, you must have a statement like
     if (volume == NaI) ...etc..
     see novice/N03/SteppingAction.cc

 3 - If you want to see fluorescence, use G4LowEnergyPhotoElectic process.
     (take care of double counting in efficiency calculation !)

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