ABSTRACT
When gamma rays irradiate a material, the electrons are scattered by Compton scattering. Compton electrons collide with molecules in the material. The molecules are excited or ionized and the secondary electrons are ejected, while the energy of the Compton electron is lost. The collision continues until the energy of the Compton electrons becomes low enough not to excite or ionize the molecules. High-energy electrons and ions directly collide with molecules, when they irradiate a material. Molecules become excited or ionized by the interaction with the electron and ion beams in the same way as Compton electrons are produced by gamma ray irradiation.
