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beta particle

noun

, Physics.
  1. an electron or positron emitted from an atomic nucleus in a certain type of radioactive decay.


beta particle

noun

  1. a high-speed electron or positron emitted by a nucleus during radioactive decay or nuclear fission
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


beta particle

  1. A high-speed electron or positron, usually emitted by an atomic nucleus undergoing radioactive decay. Beta particles are given off naturally by decaying neutrons in radioactive atoms and can be created in particle accelerators. Beta particles have greater speed and penetrating power than alpha particles but can be stopped by a sheet of aluminum that is 2 to 3 mm thick.
  2. See more at radioactive decay


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Word History and Origins

Origin of beta particle1

First recorded in 1900–05

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beta-oxidationbeta radiation