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 ?
TOKYO, Apr 24, 2018 - (JCN Newswire) - Fujitsu announced that the array control system recently deployed for the Institute of Cosmic Ray Research (ICRR), University of Tokyo, to be used in the Cherenkov Telescope Array (CTA), a gamma ray observatory capable of observations with a sensitivity aiming to be more than ten times greater than existing gamma ray telescopes, has now commenced operations.
For each gamma ray, the energy difference spectrum was generated for 2%, 4%, 6%, and 8% chlorine by subtracting the background spectrum from the sample spectrum and normalizing to the same neutron flux.
The electromagnetic spectrum ranges from radio waves (some of which have photon energies of 10-9 eV), through visible light (a few eV), to higher-energy x-rays (10 keV and up) and gamma rays (mostly 100 keV and up).
[.sup.24]Na has a lifetime of 15 h and emits more than 4 MeV of gamma rays when it decays.
Electron beam, X-ray and gamma ray food irradiation facilities are all multimillion-dollar propositions.
Trial 1.--In Trial 1, the gamma ray detector was fixed at 82 mm from the plastic container with the [Co.sup.57] source attached to the bottom of the container.
"Gamma rays, as the most energetic form of light, tell us about the most violent, energetic processes and objects in the universe," says my colleague David Thompson of NASA's Goddard Space Flight Center in Greenbelt, Maryland.
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.
But now we can observe lightning in gamma rays -- ionizing radiation.
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].n] + p [right arrow] d + [gamma], we need an intense source of polarized neutrons in the meV energy range, a hydrogen target, a high-efficiency, large solid angle [gamma]-ray detector, and a means of reversing the spin of the neutron beam without altering any other experimental conditions.
Using the High Energy Stereoscopic System (HESS) gamma ray telescopes in Namibia, the researchers have surveyed the Milky Way in gamma ray light for the past 15 years.