a positively charged nuclear particle, identical with the nucleus of a helium atom, that is ejected at high speed from the nucleus of some radioactive substances when they decay: compare beta particle
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| 单词 | alpha particle |
| 释义 | alpha particlenouna positively charged nuclear particle, identical with the nucleus of a helium atom, that is ejected at high speed from the nucleus of some radioactive substances when they decay: compare beta particle |
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