beta particle

US /ˈbeɪtə ˌpɑːrtɪkl/

UK /ˈbeɪtə ˌpɑːrtɪkl/

β粒子

a fast-moving electron or positron emitted during radioactive decay of an atomic nucleus.

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The radioactive isotope decays by emitting a beta particle.

放射性同位素通过发射β粒子衰变。