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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Gamma de-cay is always a great word to know.
So is quincunx. Does it mean:
a gadget; dingus; thingumbob.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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