Alpha Particle 29
Alpha Particle 29 : Nuclear Energy and Nuclear Disasters. The alpha particle emitted by a radioactive element is a nucleus of a Helium atom, containing two neutrons plus two protons. In general, external alpha contamination is not a critical danger as a few centimeters of air, paper, or the thin layer of dead skin cells form a sufficient shield against them. Inner contamination by ingestion, inhalation or injuries is more serious due to the high absorbed radiation dose on a short distance
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