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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
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for gamma-ray
Contemporary Examples
Historical Examples
  • Meanwhile they amused themselves occasionally by planting a gamma-ray bomb in each of Mars' major cities.

    The Ultimate Weapon John Wood Campbell
  • The figure on the next page shows the gamma-ray spectrum for the patient.

    The Atomic Fingerprint Bernard Keisch
  • A source of neutrons to activate the material and a gamma-ray spectrometer to measure the radiation from the material afterwards.

    The Atomic Fingerprint Bernard Keisch
  • gamma-ray spectra are collected all day, first from a sample, then from its accompanying standard.

    The Atomic Fingerprint Bernard Keisch
  • Then you place each card, in turn, on a holder close to the gamma-ray detector for a period of 10 minutes.

    The Atomic Fingerprint Bernard Keisch
  • Somewhere in Cairo there must be a company that used X-ray or gamma-ray photography to check large castings.

    The Egyptian Cat Mystery Harold Leland Goodwin
  • The two gamma-ray spectra you obtain look like those in the figure on the opposite page.

    The Atomic Fingerprint Bernard Keisch
gamma-ray in Medicine

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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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gamma-ray in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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