Alpha Particles |
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| Alpha Radiation; Radiation, Alpha; Alpha Particle; Alpha Radiations; Alpha Ray; Particle, Alpha; Particles, Alpha; Radiations, Alpha; Ray, Alpha; Rays, Alpha | |
| 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. | |