Alpha Particle (ionizing radiation)
Alpha Particle (ionizing radiation) : Two neutrons and two protons bound as a single particle (a helium nucleus) that is emitted from the nucleus of certain radioactive isotopes in the process of disintegration. It carries much more energy than gamma or beta radiation, and deposits that energy very quickly while passing through matter. When alpha particles are being measured in an environmental sample, they can be absorbed by the sample itself unless the sample has been prepared to be very thin. Corrections can be applied for this self-absorption of alpha particles in some samples (e.g. air filters). Plutonium-239 emits alpha particles
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