Abstract
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Photons interact with matter in one of three ways: 1) Photoelectric,
in which the photon transfers all of its energy to an atomic electron;
2) Compton Scattering, in which the photon loses part of its energy
to an atomic electron and is deflected from its original path; 3) Pair
Production, in which photon energy leads to the creation of a positron-electron
pair. The positron then annihilates with an electron, emitting 1.022
MeV of energy in the form of two 511 keV photons emitted in opposite
directions (conservation of momentum).
