As far as the photon fate after the interaction with an
atom is concerned there are two possible outcomes:
• Photon disappears (i.e., is absorbed completely) and a portion
of its energy is transferred to light charged particles (electrons
and positrons in the absorbing medium).
• Photon is scattered and two outcomes are possible:
• The resulting photon has the same energy as the incident photon and no
light charged particles are released in the interaction.
• The resulting scattered photon has a lower energy than the incident photon
and the energy excess is transferred to a light charged particle (electron).
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