Alpha particle
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An alpha particle is a positively charged particle (a Helium-4 nucleus) made up of two neutrons and two protons. It is the least penetrating of the three common forms of radiation, being stopped by a sheet of paper. It is not dangerous to living things unless the alpha-emitting substance is inhaled or ingested or comes into contact with the lens of the eye.[1]
- ↑ Glencoe Physics, Principles and Problems, Teacher Edition.