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  1. Oxford Dictionary

    beta particle

    • n.
      a fast-moving electron emitted by radioactive decay of substances (originally regarded as rays).

    • noun: beta particle, plural noun: beta particles

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    beta particle

    • IPA[ˈbādə ˌpärdəkəl]

    美式

    • n.
      a fast-moving electron emitted by radioactive decay of substances. (The emission of beta ...

    Oxford American Dictionary