Physics Athens 2016

Attenuation coefficient m

• each photon interaction process it’s represented by its own attenuation coefficient ( e,t,s,k,z ). The sum of coefficients gives m • Photoelectric absorption, Compton effect and Pair production are dominant in the energy range of interest (0.1 – 100 MeV) Photonuclear interactions (z) m  e + t + s + k + z Photoelectric effect (t)

Pair production (k)

Elastic scattering (e)

Compton effect (s)