A chemical that releases light of a particular color when struck by ionizing radiation is called a phosphor. The electron then returns to its ground energy level by emitting the extra energy as a photon of light. The particle usually comes from the radioactive decay of an atom of a radioisotope, an isotope of an element which is radioactive. Radioluminescence occurs when an incoming particle of ionizing radiation collides with an atom or molecule, exciting an orbital electron to a higher energy level. Radioluminescence is also sometimes seen around high-power radiation sources, such as nuclear reactors and radioisotopes. Radioluminescent paint is occasionally used for clock hands and instrument dials, enabling them to be read in the dark. Radioluminescence is used as a low level light source for night illumination of instruments or signage. Radioluminescence is the phenomenon by which light is produced in a material by bombardment with ionizing radiation such as alpha particles, beta particles, or gamma rays. It consists of a sealed glass tube containing radioactive tritium gas whose inner surfaces are coated with a phosphor. Light produced in a material by bombardment with ionizing radiation Radioluminescent 1.8- curie (67 GBq) 6-by-0.2-inch (152.4 mm × 5.1 mm) tritium vial used as a light source.
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