gam'ma ray"

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.

gamma irongamma-ray astronomy
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