Natural Phenomenon or Process
alpha radiation Audio
al·pha ra·di·a·tion
Definitions related to alpha radiation:
  • (alpha particle) A positively charged particle ejected spontaneously from the nuclei of some radioactive isotopes. It is a helium nucleus that has a mass number of 4 and an electrostatic charge of +2e. (NTI)
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • An emission of positively charged particles composed of two protons and two neutrons, i.e., helium nuclei, emitted during disintegration of very heavy isotopes; a beam of alpha particles or an alpha ray has very strong ionizing power, but weak penetrability.
    NCI
    U.S. National Cancer Institute, 2021
  • Radioactive decay particles consisting of a helium nucleus (2p2n++) ejected at high speed.
    CRISP Thesaurus
    National Institutes of Health, 2006
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