钍衰变链
钍衰变链是指钍-232的4n链。由自然产生的钍-232开始,这个衰变链的衰变产物包括以下几种元素:锕、铋、铅、钋、镭及氡,它们都短暂或长期地存在于任何含有钍元素的合金、化合物或矿藏中。

核素 | 旧元素符号 | 旧称 | 衰变形式 | 半衰期 | 释放能量,MeV* | 衰变产物 |
---|---|---|---|---|---|---|
252Cf | α | 2.645 a | 6.1181 | 248Cm | ||
248Cm | α | 3.4×105 a | 6.260 | 244Pu | ||
244Pu | α | 8×107 a | 4.589 | 240U | ||
240U | β− | 14.1 h | .39 | 240Np | ||
240Np | β− | 1.032 h | 2.2 | 240Pu | ||
240Pu | α | 6561 a | 5.1683 | 236U | ||
236U | α | 2.3·107 a | 4.494 | 232Th | ||
232Th | Th | Thorium | α | 1.405·1010 a | 4.081 | 228Ra |
228Ra | MsTh1 | 新钍1(Mesothorium 1) | β− | 5.75 a | 0.046 | 228Ac |
228Ac | MsTh2 | 新钍2(Mesothorium 2) | β− | 6.15 h | 2.124 | 228Th |
228Th | RdTh | 射钍(Radiothorium) | α | 1.9116 a | 5.520 | 224Ra |
224Ra | ThX | 钍X(Thorium X) | α | 3.6319 d | 5.789 | 220Rn |
220Rn | Tn | 钍射气(Thoron) | α | 55.6 s | 6.404 | 216Po |
216Po | ThA | 钍A(Thorium A) | α | 0.145 s | 6.906 | 212Pb |
212Pb | ThB | 钍B(Thorium B) | β− | 10.64 h | 0.570 | 212Bi |
212Bi | ThC | 钍C(Thorium C) | β− 64.06% α 35.94% |
60.55 min | 2.252 6.208 |
212Po 208Tl |
212Po | ThC' | 钍C'(Thorium C') | α | 299 ns | 8.955 | 208Pb |
208Tl | ThC" | 钍C"(Thorium C") | β− | 3.053 min | 4.999 | 208Pb |
208Pb | - | 稳定 | - | - | 无 |
- 注:“释放能量”不等于衰变射线的能量。如果为α衰变,α粒子能量比“释放能量”偏小。如果为β衰变,β射线能量为连续谱,最大不超过该能量。详细衰变数据可参考:Berkeley Laboratory Isotopes Project 整理的相关数据: https://web.archive.org/web/20061205022425/http://ie.lbl.gov/education/isotopes.htm 或者 NNDC, Brookhaven National Laboratory 整理的相关数据:http://www.nndc.bnl.gov/chart/ 。
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