High Quality Content by WIKIPEDIA articles! Radioluminescence is the phenomenon by which luminescence is produced in a material by the bombardment of ionizing radiation such as beta particles. Examples of common radioluminescent products are the tritium-excited light sources used on watch dials and gun sights, and the now-disused mixture of radium and copper-doped zinc sulfide luminous paint used historically to paint clock dials. Radioluminescence occurs when an incoming radiation particle collides with an atom or molecule, exciting an orbital electron to a higher energy level. The electron then returns to its ground energy level by emitting the extra energy as a photon of light.

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