Radioluminescence is the phenomenon where certain materials emit light when they are exposed to radiation, such as alpha particles, beta particles, or gamma rays. This process occurs when the energy from the radiation excites the atoms in the material, causing them to release energy in the form of visible light. Common examples of radioluminescent materials include zinc sulfide and strontium aluminate. This effect is often utilized in various applications, including radioluminescent paints for watch dials and emergency exit signs. Radioluminescence can also be observed in certain minerals and is studied in fields like geology and nuclear science to understand the properties of radioactive materials.