gamma ray


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gamma ray

n.
1. 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.
2. A narrow beam of such photons.

gam′ma-ray′ adj.

gam′ma ray`


n.
1. a highly penetrating photon of high frequency, usu. 1019 Hz or more, emitted by an atomic nucleus.
2. a stream of such photons.
[1900–05]

gamma ray

A stream of electromagnetic radiation having wavelengths shorter than those of x-rays and therefore greater energy and penetrating power. Gamma rays are given off by unstable nuclei during radioactive decay. ♦ The emission of gamma rays by a nucleus is called gamma decay. Gamma decay does not change the atomic number or the mass number of an element. See more at radiation, radioactive decay.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.gamma ray - electromagnetic radiation emitted during radioactive decay and having an extremely short wavelength
electromagnetic radiation, electromagnetic wave, nonparticulate radiation - radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
electromagnetic spectrum - the entire frequency range of electromagnetic waves
References in periodicals archive ?
There are two main ways to turn a gamma ray into electrical energy.
Until recently, gamma rays have been the exclusive source of food irradiation in this country.
In Trial 1, the gamma ray detector was fixed at 82 mm from the plastic container with the [Co.
For about 40 seconds, the satellite measured a sharp pulse of gamma rays.
This discovery was made with a second CGRO instrument, the Energetic Gamma Ray Experiment Telescope (EGRET), built under the direction of Carl Fichtel, who was then at the Goddard Space Flight Center.
1929) studied conditions under which atoms that were part of a crystal would emit a gamma ray in such a way that the recoil would be spread over all the atoms making up the crystal.
MARYLAND (CyHAN)- This animation tracks several gamma rays through space and time, from their emission in the jet of a distant blazar to their arrival in Fermi's Large Area Telescope (LAT).
To measure the parity-violating gamma ray asymmetry in [[right arrow].
But when antimatter comes into contact with ordinary matter, the two kinds of matter instantly annihilate each other, producing gamma rays, which can be detected by instruments outside Earth's shielding atmosphere.
During its first year in orbit, GRO recorded gamma rays from quasars that lie between 10 billion and 20 billion light years from Earth and that emit 10 to 100 million times the total gamma-ray output of the Milky Way.
The NPDGamma [gamma]-ray detector has been built to measure, with high accuracy, the size of the small parity-violating asymmetry in the angular distribution of gamma rays from the capture of polarized cold neutrons by protons.
Scientists using the National Aeronautics and Space Administration's orbiting Compton Gamma Ray Observatory said the 150-minute flare turned the quasar known as PKS 1622-297 into the brightest gamma-ray source in the sky for several days last summer.