Photon Interaction (Tightly Bound)

1.4.1 Slide 5 (125/194)
1.4 PHOTON INTERACTIONS
1.4.1 Types of indirectly ionizing photon irradiations
􀀁 A tightly bound electron is an electron whose binding
energy is comparable to, larger than, or slightly smaller
than the photon energy .
• For a photon interaction to occur with a tightly bound electron, the
binding energy of the electron must be of the order of, but
slightly smaller, than the photon energy
• An interaction between a photon and a tightly bound electron is
considered an interaction between photon and the atom as a
whole.

Photoelectric effect (tightly bound)