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Beta particle emission
Definition: A naturally occurring type of radioactive decay wherein an electron is ejected at high speed from the nucleus, typical of nuclei that have too many neutrons to be energetically stable. An antineutrino accompanies this emission, and sometimes one or more gamma rays as well. Also known as beta emission.
Source: Kelter P, Mosher M, and Scott A (2008). Chemistry: the Practical Science. New York: Houghton Mifflin Company.