Dictionary  gam'ma ray"Physics. 1. a photon of penetrating electromagnetic radiation (gam'ma radia"tion) emitted from an atomic nucleus. 2. a photon emitted by an electron as a result of internal conversion. 3. electromagnetic radiation with wavelengths shorter than approximately one tenth of a nanometer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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