beta particle

US /ˈbeɪtə ˌpɑːrtɪkl/
UK /ˈbeɪtə ˌpɑːrtɪkl/
"beta particle" picture
1.

β粒子

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

:
The radioactive isotope decays by emitting a beta particle.
放射性同位素通过发射β粒子衰变。