fission product

World English Dictionary
fission product
 
n
a nuclide produced either directly by nuclear fission or by the radioactive decay of such a nuclide

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

fission product n.
A usually radioactive isotope produced as a result of the fission of a massive atom such as U235.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

fission product

in physics, any of the lighter atomic nuclei formed by splitting heavier nuclei (nuclear fission), including both the primary nuclei directly produced (fission fragments) and the nuclei subsequently generated by their radioactive decay. The fission fragments are highly unstable because of their abnormally large number of neutrons compared with protons; consequently they undergo successive radioactive decays by emitting neutrons, by converting neutrons into protons, antineutrinos, and ejected electrons (beta decay), and by radiating energy (gamma decay).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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