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gamma ray |
Also found in: Medical, Wikipedia | 0.01 sec. |
gamma rayPenetrating very short-wavelength electromagnetic radiation, similar to an X-ray but of higher energy, that is emitted spontaneously by some radioactive substances (see gamma decay; radioactivity). Gamma radiation also originates in the decay of certain subatomic particles and in particle-antiparticle annihilation (see also antimatter). Gamma rays can initiate nuclear fission, can be absorbed by ejection of an electron (see photoelectric effect), and can be scattered by free electrons (see Compton effect). gamma ray [′gam·ə ‚rā] (nuclear physics) A high-energy photon, especially as emitted by a nucleus in a transition between two energy levels. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Enigmatic Eruptions: Gamma-ray bursts lack supernova fireworks" (SN: 9/23/06, p. Astronomers were drawn to the distant explosion by a gamma-ray burst--radiation of extremely high energy. 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. |
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