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alpha ray

noun Physics.
  1. a stream of alpha particles.
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Origin of alpha ray

First recorded in 1900–05
Also called alpha radiation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for alpha radiation

alpha radiation

noun
  1. alpha particles emitted from a radioactive isotope
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alpha ray

noun
  1. ionizing radiation consisting of a stream of alpha particles
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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

alpha radiation in Medicine

alpha ray

n.
  1. A stream of alpha particles or a single high-speed alpha particle.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

alpha radiation in Science

alpha ray

  1. A stream of alpha particles.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

alpha radiation in Culture

alpha radiation

[(al-fuh)]

Particles sent out by some radioactive nuclei, each particle consisting of two protons and two neutrons bound together. Alpha particles carry a positive charge. (See beta radiation and gamma radiation.)

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Note

Alpha radiation, unlike gamma radiation, has low penetrating power; it can be stopped by clothing.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.