How many light photons are produced on average when a 511 keV gamma ray undergoes a photoelectric interaction in the sodium iodide scintillator crystal used in a detector? What proportion of the incident gamma ray energy does this comprise? What processes in the crystal contribute to this difference?
No light photons will be produced in this case as the energy of the incident radiation is much larger than 100 KeV and hence the compton interaction becomes the significant form of interaction for the incident gamma radiations thus for the phtotopeak we have total absorption in the crystal and no production of photons is taking place due to photoelectric interaction.
This is mainly due to Compton interactions and partly due to pair production mechanism of interactions for gamma radiations with matter.
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