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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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