gamma ray
noun Physics.
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.
Origin of gamma ray
First recorded in 1900–05
Words nearby gamma ray
British Dictionary definitions for gamma rays
gamma rays
pl n
streams of gamma radiation
Medical definitions for gamma rays
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.
Scientific definitions for gamma rays
gamma ray
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.