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beta particle

noun
🔊/ˈbiːtə pɑːtɪkl/
🔊/ˈbeɪtə pɑːrtɪkl/
(also beta ray
🔊/ˈbiːtə reɪ/
🔊/ˈbeɪtə reɪ/
)
(physics物理)
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  1. a fast-moving electron that is produced when some radioactive substances decay (= start to break down)* β 粒子；贝塔粒子
    • the properties of beta particlesβ粒子的性质
    • beta particle emissionβ粒子发射