gamma de-cay

gamma decay

noun Physics.
type of radioactivity in which an unstable atomic nucleus dissipates energy by gamma emission, producing gamma rays.
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Science Dictionary
gamma decay  
A radioactive process in which an atomic nucleus loses energy by emitting a gamma ray (a stream of high-energy photons). When an element undergoes gamma decay its atomic number and mass number do not change.
The American Heritage® Science Dictionary
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