Changes

''[[High LET linear transfer radiation'']]: Radiation with capacity, by its own or by the secondary radiations it generates, of linear energy transfer higher than around 10 keV μm^-1. Normally high LET radiation is assumed to include protons, neutrons and alpha particles (or other particles of similar or greater mass) except for protons having energies greater than around 4 MeV.

''[[Low LET linear energy transfer radiation'']]: Radiation with low linear energy transfer (LET), normally assumed to comprise photons (including X rays and gamma radiation), electrons, positrons and muons. High energy (>4 MeV) protons are considered to be a low LET radiation.