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Forum: Processes Involving Optical Photons
Re: Question number of optical photons remains constant (Cejo George)
Re: Feedback Re: number of optical photons remains constant (Gumplinger Peter)
Re: Question Re: number of optical photons remains constant (Ashwath Rao)
Re: Disagree Re: number of optical photons remains constant (Gumplinger Peter)
Re: Question Re: number of optical photons remains constant (Cejo George)
Date: 03 Apr, 2012
From: Gumplinger Peter <Gumplinger Peter>

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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1 Agree: Re: number of optical photons remains constant   (Ashwath Rao - 05 Apr, 2012)
(_ Feedback: Re: number of optical photons remains constant   (Ashwath Rao - 06 Apr, 2012)
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