gamma ray


Definition of gamma ray 

: a photon emitted spontaneously by a radioactive substance also : a photon of higher energy than that of an X-ray

Examples of gamma ray in a Sentence

Recent Examples on the Web

Suspects have included neutron stars, gamma ray bursts, hypernovae, and the radiation-spewing black holes at the center of some galaxies, but whatever the source, high energy neutrinos are a likely byproduct. Daniel Clery, Science | AAAS, "Ghostly particle caught in polar ice ushers in new way to look at the universe," 12 July 2018 The detection also triggered a powerful example of another new trend, multimessenger astronomy, in which telescopes and other instruments studied the flaring blazar in all parts of the electromagnetic spectrum, from gamma rays to radio waves. Daniel Clery, Science | AAAS, "Ghostly particle caught in polar ice ushers in new way to look at the universe," 12 July 2018 For example, compare the early EGRET gamma ray observatory, which flew in the 1990s, to NASA’s flagship mission Fermi, which turns 10 this year. Eileen Meyer, Smithsonian, "Big Data is Transforming How Astronomers Make Discoveries," 15 May 2018 His gamma ray detector is used in nuclear research. New York Times, "Robert N. Hall, 96, Whose Inventions Are Everywhere, Is Dead," 10 May 2018 That's good news because while our ozone layer protects us from most gamma rays, a powerful burst would be far too much to handle. Eric Limer, Popular Mechanics, "Learn the Basics of Gamma Ray Bursts in 7 Minutes," 2 Aug. 2016 Perplexingly, however, Fermi had observed no corresponding flare in gamma rays. Mark Bowen, Scientific American, "Neutrinos on Ice: Astronomers' Long Hunt for Source of Extragalactic "Ghost Particles" Pays Off," 12 July 2018 The blazar was emitting high-energy photons known as gamma rays, which are also associated with neutrinos and cosmic rays. Sophia Chen, WIRED, "What's a Blazar? A Galactic Bakery for Cosmic Rays," 12 July 2018 Beginning in the late 19th century, astronomers began observing invisible wavelengths, from radio waves to gamma rays, bands on the electromagnetic spectrum that are determined by the amount of energy their photons carry. Eoin O'carroll, The Christian Science Monitor, "Neutrino demonstration heralds a new way of observing the cosmos," 12 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gamma ray.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of gamma ray

1903, in the meaning defined above

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Last Updated

24 Sep 2018

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Time Traveler for gamma ray

The first known use of gamma ray was in 1903

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More Definitions for gamma ray

gamma ray

gam·​ma ray | \ˈga-mə-\

Kids Definition of gamma ray

: a ray that is like an X-ray but of higher energy and that is given off especially by a radioactive substance

gamma ray


Medical Definition of gamma ray 

: a photon emitted spontaneously by a radioactive substance also : a high-energy photon usually used in plural

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