- electromagnetic radiation having a wavelength of 10 centimeters or less: may be produced by the reactions of nuclei or elementary particles or by the interaction of high energy electrons with matter
- a stream of gamma rays
gamma raygamma ray
- A photon of electromagnetic radiation of very short wavelength, less than about 0.01 nanometer, and very high energy, greater than about 100,000 electron volts. Gamma rays are emitted in the decay of certain radioactive nuclei and in electron-positron annihilation.
- A narrow beam of such photons.
(plural gamma rays)
- Pertaining to gamma rays or gamma radiation.