range between 223 and 662 keV. The incident photon energies
have been changed by the Compton scattering technique.
2. Theoretical backgrounds
2.1. Compton scattering
The inelastic scattering of X-ray and gamma ray from electrons
had been known for a decade when the American researcher
Compton (Trousfanidis, 1983) showed a mathematical relationship
between incident and scattered gamma ray energies as follows: