It is used especially in 
It is used especially in the study of electrons in matter and in the production of variable energy gamma-ray beams. Discovered in 1923, it provides strong verification of the quantum theory, since it requires that one treat X rays and gamma rays as particles or photons rather than as waves. FTP name this increase in the wavelengths of scattered rays--described by the winner of the 1923 Nobel Prize in Physics.
It is used especially in the study of electrons in matter and in the production of variable energy gamma-ray beams.
{Compton} Effect