| 单词 | Radioactivity |
| 释义 | 輻射 The spontaneous disintegration of an unstable nuclide and the emission of ionising particles following the disintegration or as a consequence of a nuclear reaction. It includes the accompanying spontaneous transformation of a radionuclide into another nuclide, or a spontaneous change in the energy level of the nucleus of a radionuclide. The unit of radioactivity is becquerel (symbol: Bq; 1/s): Metrication Ordinance (Cap 124) sch 1; The International System of Units. 不穩定核種的自發性分解和隨著分解而放射的電離粒子或一個核能反應的結果。輻射包括一個輻射核種到另一個核種的伴隨自發性轉移或在輻射核種的 原子核能量水平下的自發改變。輻射的單位是貝克勒爾（符號：Bq；1/s）：《十進制條例》（第214章） 附表1；國際單位制。n. |
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