## Compton Scattering

## Compton Scattering – Cross-Sections

The probability of Compton scattering per one interaction with an atom increases linearly with atomic number Z because it depends on the number of electrons available for scattering in the target atom.** The Klein-Nishina formula describes the angular distribution** of photons scattered from a single free electron:**where ε = E**_{0}/m_{e}c^{2} and r_{0} is the “classical radius of the electron” equal to about 2.8 x 10^{-13} cm. The formula gives the probability of scattering a photon into the solid angle element dΩ = 2π sin Θ dΘ when the incident energy is E_{0}.