Note the rapid falloff for 4 MeV<unk>  compared to X rays and Protons.<unk>  beams have a finite range, after which dose falls off rapidly. Therefore, they spare deeper healthy tissue. The depth of the treatment is selected by the appropriate energy. Unlike photon beams there is no surface sparing effect, so<unk>  is used when the target extends to the patient's skin.
Electron therapy
Paramedicine
Cytoluminescent therapy
Electromagnetic therapy
Photomedicine
Negative air ionization therapy
Biological engineering
Exomedicine