Gamma-ray meaning

Frequency:
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.
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A narrow beam of such photons.
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Electromagnetic radiation having a wavelength of 10-9 centimeters or less: may be produced by the reactions of nuclei or elementary particles or by the interaction of high energy electrons with matter.
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A stream of gamma rays.
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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.
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Very high frequency (therefore very high energy) electromagnetic radiation emitted as a consequence of radioactivity.
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Pertaining to gamma rays or gamma radiation.
adjective
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