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- Dictionarybeta particle
noun
- 1. a fast-moving electron emitted by radioactive decay of substances (originally regarded as rays).
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- Beta particle
High-energy, high-speed electron or positron emitted during beta decay
A beta particle, also called beta ray or beta radiation, is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus, known as beta decay. There are two forms of beta decay, β− decay and β+ decay, which produce electrons and positrons, respectively. Wikipedia
