γ (Gamma) rays are electromagnetic waves.
- Gamma rays or gamma radiation is a stream of the high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay.
- Gamma radiation or gamma ray is an extremely high-frequency radioactive radiation consisting of high-energy photons.
- It was first discovered by a French chemist and physicist, Paul Villard in 1900. It was named gamma ray by Ernest Rutherford in 1903.