|The three primary ways in which a gamma-ray photon can
interact with matter are:
- Photoelectric absorption;
- Compton scattering; and,
- Pair production.
Photoelectric absorption predominates for low-energy gamma-rays (up to ~300 keV).
Pair production predominates for high-energy gamma-rays (~5-10 MeV).
Compton scattering is the most important process for energies in between these two
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