|Message: Re: number of optical photons remains constant||Not Logged In (login)|
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I do not know why in your simulation you find that the deposited energy in your NaI crystal is always the same, 33.2keV, for every 662keV gamma. I must assume that you either haven't defined the material NaI correctly, or/and that you have not defined the processes correctly that the 662keV gamma undergoes.
Once you get the expected energy deposit spectrum, the photo-peak, compton edge etc. that you show in your attachment, the resulting NUMBER of scintillation photons generated by the program will track (resemble) the shape of the deposited energy spectrum. The conversion deposited energy -> number of photons is the so called 'scintillation yield'. But, to say it again, you should not concern yourself with the sum of photon energies per event; just the number of scintillation photons.
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