| 单词 | beta emitter |
| 释义 | beta emitterbeta emitter[′bād·ə i′mid·ər]beta emitterbeta emitterA radioisotope which decays by emitting an electron particle. Beta emitters are labelled as “soft” emitters if the electron is of low energy and has a short penetration distance, or “hard” if it is high-energy and with a great penetrating distance. |
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