a photon of penetrating electromagnetic radiation (gamma radiation) emitted from an atomic nucleus.
a photon emitted by an electron as a result of internal conversion.
electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer.
gamma ray n.
Electromagnetic radiation emitted from the nucleus of an atom by radioactive decay and having energies in a range from ten thousand (104) to ten million (107) electron volts.
A stream of high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay. Because the wavelengths of gamma rays are shorter than those of x-rays, gamma rays have greater energy and penetrating power than x-rays. Gamma rays are emitted by pulsars, quasars, and radio galaxies but cannot penetrate the Earth’s atmosphere. See more at radioactive decay.
- Gamma-ray astronomy
[gam-uh-rey] /ˈgæm əˌreɪ/ noun 1. the branch of astronomy that deals with the study of celestial objects by means of the gamma rays that come from them. noun 1. the investigation of cosmic gamma rays, such as those from quasars
- Gamma-ray burst
noun 1. a short-lived, extremely luminous burst of gamma radiation from an unknown astronomical source, occurring at random positions in the sky several times a day. Abbreviation: GRB. noun 1. (astronomy) an intense but short-lived burst of gamma rays from an unknown celestial source. First detected in 1970, they have since been found to be […]
- Gamma stock
noun 1. any of the third rank of active securities on the London Stock Exchange. Prices displayed by market makers are given as an indication rather than an offer to buy or sell
/xamat/ noun 1. (South African, derogatory) a reference to the accent of Cape Coloured people