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alpha particle; helium nucleus (radiation, emission)
A charged particle consisting of 2 neutrons & 2 protons (charge = 2e+) emitted during nuclear decay of heavy elements (atomic # >= 82). It is identical to the helium nucleus.
Related
helium [He]
periodic table
General
atomic particle
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999