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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Lindstrom et al., Database of Prompt Gamma-Rays from Slow Neutron Capture for Elemental Analysis, INTERNATIONAL ATOMIC ENERGY AGENCY, Vienna, Austria, 2006.
Gamma-ray binary is the name given to a system of two stars, one a normal star and the other either a neutron star or a black hole, whose radiative output is dominated by gamma-rays - the highest-energy form of light.
He said that Neutron Stars have such strong magnetic fields (a million times stronger than those of Black Holes) that producing gamma-rays are more difficult.
A total of eight events were recorded in the timing spectrum of genuine proton events detected in triple coincidence with electrons and gamma-rays in the energy range 35 keV to 100 keV.
Those fluctuations would be sensed more acutely by higher-energy gamma-rays because these photons have shorter wavelengths.
Since its launch in 2008, Fermi's Large Area Telescope (LAT) has mapped million- to billion-electron-volt (MeV to GeV) gamma-rays from supernova remnants.
At that distance, the intensity of the gamma-rays unleashed during the 100-second-long burst indicates that it was the most energetic ever recorded, surpassing a burst dubbed the second Big Bang (SN: 5/9/98, p.
"Although this apparent speed was an illusion caused by actual motion almost directly toward us at 99.87 percent the speed of light, this knot was the key to determining the location where the gamma-rays were produced in the black hole's jet," Marscher said.
Those data originate from the slowly declining tail of gamma-rays observed on Aug.
Using infrared telescopes, which can detect galaxies hidden by dust, they surveyed small patches of sky around the locations of several bright gamma-rays bursts.