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beta particle

noun, Physics.
an electron or positron emitted from an atomic nucleus in a certain type of radioactive decay.
Origin of beta particle
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for beta particle
  • When a radioactive nuclei emits a beta particle, a neutron transforms into a proton.
  • When a neutron transforms to a proton and a beta particle.
  • The beta particle can cause harm by ionizing atoms in its path, until it eventually stops and becomes a harmless electron.
  • As the beta particle approaches an atom it can interact with the nucleus by attraction.
  • It does not pose an external hazard because it decays by emitting a relatively low-energy beta particle with no gamma radiation.
British Dictionary definitions for beta particle

beta particle

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
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beta particle in Medicine

beta particle n.
A high-speed electron or positron, especially one emitted from the nucleus of an atom in radioactive decay.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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beta particle in Science
beta particle  
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. See more at radioactive decay.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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