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gamma ray |
Also found in: Medical, Wikipedia | 0.09 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). 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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Those fluctuations would be sensed more acutely by higher-energy gamma-rays because these photons have shorter wavelengths. 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. |
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