Gamma ray

Gamma rays or gamma-ray (denoted as γ) are forms of electromagnetic radiation (EMR) or light emissions of a specific frequency produced from sub-atomic particle interaction, such as electron-positron annihilation and radioactive decay; most are generated from nuclear reactions occurring within the interstellar medium of space. Gamma rays are generally characterized as electromagnetic radiation, having the highest frequency and energy, and also the shortest wavelength, within the electromagnetic spectrum, i.e. high energy photons. Due to their high energy content, they are able to cause serious damage when absorbed by living cells.
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Gamma ray n. Electromagnetic radiation emitted from the nucleus of an atom by radioactive decay and having energies in a range from ten thousand to [more]Gamma ray - Community and Resources

Noun
1. electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength
(synonym) gamma radiation
(hypernym) electromagnetic radiation, electromagnetic wave, nonparticulate radiation
(part-holonym) electromagnetic spectrum

A type of high-energy radiation that is different from an x-ray.

Synonyms and related words:
Becquerel ray, Grenz ray, Roentgen ray, X radiation, X ray, actinic ray, actinism, alpha radiation, alpha ray, anode ray, atomic beam, atomic ray, beam, beam of light, beta radiation, beta ray, canal ray, cathode ray, cosmic radiation, cosmic ray, cosmic ray bombardment, electron emission, gamma radiation, gleam, infrared ray, infraroentgen ray, invisible radiation, leam, nuclear rays, patch, pencil, photon, positive ray, radiation, radiorays, ray, ray of light, ribbon, ribbon of light, solar rays, streak, stream, stream of light, streamer, ultraviolet ray, violet ray