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单词 alpha particle
释义

WordReference Random House Unabridged Dictionary of American English © 2024
alpha par′ticle, [Physics.]
  1. Physicsa positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission;
    the nucleus of a helium atom.
  • 1900–05

Collins Concise English Dictionary © HarperCollins Publishers::
alpha particle n
  1. a helium-4 nucleus, containing two neutrons and two protons, emitted during some radioactive transformations
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