Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The radioactive decay of an atomic nucleus by emission of an alpha particle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Radioactive decay by emitting an alpha particle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle

Etymologies

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Examples

  • An example of alpha decay is the change of the very radioactive isotope uranium-238 (with 92 protons and 146 neutrons) to thorium-234 (with 90 protons and 144 neutrons).

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