Ionizing radiation

thumb|Natural color X-ray photogram of a wine scene. Note the edges of hollow cylinders as compared to the solid candle. thumb|William D. Coolidge|William Coolidge explains medical imaging and X-rays.

high-speed, i.e. high-energy particle, mainly originating in outer space, outside the Solar system

particle of alpha radiation; helium-4 nucleus; particle of two protons and two neutrons

radiation that carries enough energy to liberate electrons from atoms or molecules

high-energy, high-speed electron or positron emitted during beta decay

Ionizing radiation that presents as free neutrons

level of ionizing radiation present in the natural environment

beam of positive rays that are created by certain types of gas discharge tubes

path length of maximum energy loss of ionizing radiation

aspect of history