the property possessed by some elements, e.g. uranium, of spontaneously emitting alpha, or beta, or rays and sometimes also gamma rays by the disintegration of the nuclei of atoms
| 单词 | radioactivity |
| 释义 | radioactivitynounthe property possessed by some elements, e.g. uranium, of spontaneously emitting alpha, or beta, or rays and sometimes also gamma rays by the disintegration of the nuclei of atoms |
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