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| Alpha Particles Alpha Rays | 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. | |
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