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Interactions in matter
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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 extremes.

This section contains the following topics:

Photoelectric absorption
Compton scattering
Pair production
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