What is an alpha particle?

The alpha particle is a type of ionizing radiation. With its partners the gamma particles and beta particles, alpha particles are one of the most prevalent forms of radiation. An alpha particle is essentially a helium nucleus, which consists of two neutrons and two protons, without electrons, giving it a net positive charge.

Due to its relatively high mass, alpha particles are the most destructive form of ionizing radiation, but the trade-off is that their penetration is low. A piece of paper stops alpha particles, whereas the lighter beta particles require a aluminum barrier. Alpha particles are emitted from various radioactive substances.

Unlike beta decay, alpha decay (the process whereby alpha particles are emitted from a radioactive nucleus) is mediated by the strong force. According to classical Newtonian laws, the attraction of the nucleus should be too strong to let alpha particles leave it under any circumstances. However, quantum tunneling permits it anyway.

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