Alpha Radiation

**Semantic type:** Natural Phenomenon or Process

**Definition:** 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.

**Synonyms:** - ALPHA PARTICLE - Alpha Particle Radiation - Alpha-Radiation - Helium Ion Radiation - Helium-Ion Radiation - Helium-Ion Radiation