Compton Scattering
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Compton Scattering is the collision process between a gamma ray and a bound atomic electron where only part of the gamma-ray energy is transferred to the electron.
The effect was at first observed by Arthur Holly Compton in 1923 at Washington University in St. Louis. Compton was rewarded the 1927 Nobel Prize in Physics for this discovery.
The probability for Compton scattering is approximately proportional to Z, and for energies greater than 500 keV approximately proportional to 1/Egamma