锕衰变链
锕衰变链是指锕-227的4n+3链。由少量存在于自然中的钚-239开始，该衰变链的衰变产物有铀、钍、镤、锕、钫、镭、氡、钋、砹、铋、铅、铊。它们都短暂或长期地存在于任何含有铀元素的合金、化合物或矿藏中。该系列于稳定同位素铅-207处终止。
图中绿线为锕衰变链
在整个过程中释放出的能量（指从U-235到Pb-207，包括中微子能量），为46.4MeV。
衰变产物表
(详细说明)
| 核素 | 历史名称（短） | 历史名称（长） | 衰变模式 | 半衰期 （a=年） |
释放能量（单位MeV） | 衰变产物 |
|---|---|---|---|---|---|---|
| 239Pu | α | 2.41·104 a | 5.244 | 235U | ||
| 235U | AcU | Actin Uranium | α | 7.04·108 a | 4.678 | 231Th |
| 231Th | UY | Uranium Y | β− | 25.52 h | 0.391 | 231Pa |
| 231Pa | Protactinium | α | 32760 a | 5.150 | 227Ac | |
| 227Ac | Ac | Actinium | β− 98.62% α 1.38% |
21.772 a | 0.045 5.042 |
227Th 223Fr |
| 227Th | RdAc | Radioactinium | α | 18.68 d | 6.147 | 223Ra |
| 223Fr | AcK | Actinium K | β− 99.994% α 0.006% |
22.00 min | 1.149 5.340 |
223Ra 219At |
| 223Ra | AcX | Actinium X | α | 11.43 d | 5.979 | 219Rn |
| 219At | α 97.00% β− 3.00% |
56 s | 6.275 1.700 |
215Bi 219Rn | ||
| 219Rn | An | Actinon, Actinium Emanation |
α | 3.96 s | 6.946 | 215Po |
| 215Bi | β− | 7.6 min | 2.250 | 215Po | ||
| 215Po | AcA | Actinium A | α 99.99977% β− 0.00023% |
1.781 ms | 7.527 0.715 |
211Pb 215At |
| 215At | α | 0.1 ms | 8.178 | 211Bi | ||
| 211Pb | AcB | Actinium B | β− | 36.1 min | 1.367 | 211Bi |
| 211Bi | AcC | Actinium C | α 99.724% β− 0.276% |
2.14 min | 6.751 0.575 |
207Tl 211Po |
| 211Po | AcC' | Actinium C' | α | 516 ms | 7.595 | 207Pb |
| 207Tl | AcC" | Actinium C" | β− | 4.77 min | 1.418 | 207Pb |
| 207Pb | AcD | Actinium D | N/A | 稳定 | N/A | N/A |
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