beta-particle

phenomenon

Definition: A beta particle, also called beta ray or beta radiation (symbol β), is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay. There are two forms of beta decay, β− decay and β+ decay, which produce electrons and positrons respectively.Beta particles with an energy of 0.5 MeV have a range of about one metre in the air; the distance is dependent on the particle energy.

Source: Wikipedia

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