Th
Thorium
Z 90 232.038 g/molActinide Radioactive
| 232Th | 142 | 232.0381 | 35,446.7 | 99.98% | 14.0 Gy | 0+ | α→228Ra(~100%) SF(1.1e-9%) CD(<2.78e-10%) β⁻ | 1898 |
| 230Th | 140 | 230.0331 | 30,862.5 | 0.02% | 75.4 ky | 0+ | α→226Ra(~100%) CD→206Hg(5.8e-11%) SF(<4e-12%) | 1907 |
| 208Th | 118 | 208.0179 | 16,690.0 | --- | 2.4 ms | 0+ | α→204Ra(100%) | 2010 |
| 209Th | 119 | 209.0176 | 16,400.0 | --- | 60.0 ms | (5/2-) | α→205Ra β⁺→209Ac | --- |
| 209mTh | 119 | 209.018 | 16,765.0 | --- | 3.1 ms | 13/2+ | α→205Ra(100%) β⁺→209Ac | 1996 |
| 210Th | 120 | 210.0151 | 14,060.0 | --- | 16.0 ms | 0+ | α→206Ra(100%) β⁺→210Ac | 1995 |
| 211Th | 121 | 211.0149 | 13,880.0 | --- | 48.0 ms | (5/2-) | α→207Ra(100%) β⁺→211Ac | 1995 |
| 212Th | 122 | 212.013 | 12,111.0 | --- | 31.7 ms | 0+ | α→208Ra(100%) β⁺→212Ac | 1980 |
| 213Th | 123 | 213.013 | 12,120.0 | --- | 144.0 ms | 5/2- | α→209Ra(100%) β⁺→213Ac | 1968 |
| 213mTh | 123 | 213.0143 | 13,300.0 | --- | 1.4 µs | (13/2+) | γ→213Th(100%) | 2007 |
| 214Th | 124 | 214.0115 | 10,695.0 | --- | 87.0 ms | 0+ | α→210Ra(100%) β⁺→214Ac | 1968 |
| 214mTh | 124 | 214.0138 | 12,876.0 | --- | 1.24 µs | (8+) | γ→214Th(100%) | 2007 |
| 215Th | 125 | 215.0117 | 10,921.0 | --- | 1.35 s | (1/2-) | α→211Ra(100%) | 1968 |
| 215mTh | 125 | 215.0133 | 12,390.0 | --- | 770.0 ns | (9/2+) | γ→215Th(100%) | 2005 |
| 216Th | 126 | 216.0111 | 10,299.0 | --- | 26.28 ms | 0+ | α→212Ra(100%) β⁺→216Ac | 1968 |
| 216mTh | 126 | 216.0132 | 12,340.0 | --- | 135.4 µs | 8+ | γ→216Th(97.2%) α→212Ra(2.8%) | 1983 |
| 216nTh | 126 | 216.0139 | 12,947.0 | --- | 580.0 ns | (11-) | γ→216Th(100%) | 1983 |
| 217Th | 127 | 217.0131 | 12,206.0 | --- | 248.0 µs | (9/2+) | α→213Ra(100%) | 1968 |
| 217mTh | 127 | 217.0138 | 12,879.0 | --- | 141.0 ns | (15/2-) | γ→217Th(100%) | 1989 |
| 217nTh | 127 | 217.0156 | 14,510.0 | --- | 71.0 µs | (25/2+) | γ→217Th(100%) | 2002 |
| 218Th | 128 | 218.0133 | 12,367.0 | --- | 122.0 ns | 0+ | α→214Ra(100%) | 1973 |
| 219Th | 129 | 219.0155 | 14,460.0 | --- | 1.02 µs | (9/2+) | α→215Ra(100%) β⁺→219Ac | 1973 |
| 220Th | 130 | 220.0158 | 14,690.0 | --- | 10.2 µs | 0+ | α→216Ra(100%) EC→220Ac | 1973 |
| 221Th | 131 | 221.0182 | 16,940.0 | --- | 1.75 ms | (7/2+) | α→217Ra(100%) | 1970 |
| 222Th | 132 | 222.0185 | 17,203.0 | --- | 2.24 ms | 0+ | α→218Ra(100%) EC→222Ac | 1970 |
| 223Th | 133 | 223.0208 | 19,385.0 | --- | 600.0 ms | (5/2+) | α→219Ra(100%) | 1952 |
| 224Th | 134 | 224.0215 | 19,996.0 | --- | 1.04 s | 0+ | α→220Ra(100%) β⁺ | 1949 |
| 225Th | 135 | 225.024 | 22,310.0 | --- | 8.75 m | 3/2+ | α→221Ra(90%) EC→225Ac | 1949 |
| 226Th | 136 | 226.0249 | 23,198.0 | --- | 30.7 m | 0+ | α→222Ra(~100%) CD→208Pb(<3.2e-12%) | 1948 |
| 227Th | 137 | 227.0277 | 25,804.8 | --- | 18.69 d | (1/2+) | α→223Ra(100%) | 1906 |
| 228Th | 138 | 228.0287 | 26,770.9 | --- | 1.91 y | 0+ | α→224Ra(~100%) CD→208Pb(1.13e-11%) | 1905 |
| 229Th | 139 | 229.0318 | 29,585.5 | --- | 7.92 ky | 5/2+ | α→225Ra(100%) | 1947 |
| 229mTh | 139 | 229.0318 | 29,585.5 | --- | 7.0 µs | (3/2+) | γ→229Th(100%) | 1994 |
| 231Th | 141 | 231.0363 | 33,815.8 | --- | 1.06 d | 5/2+ | β⁻→231Pa(100%) | 1911 |
| 233Th | 143 | 233.0416 | 38,731.6 | --- | 21.83 m | 1/2+ | β⁻→233Pa(100%) | 1935 |
| 233mTh | 143 | 233.0416 | 38,737.7 | --- | 2.0 s | (7/2-) | γ→233Th β⁻→233Pa | --- |
| 234Th | 144 | 234.0436 | 40,613.0 | --- | 24.11 d | 0+ | β⁻→234Pa(100%) α→230Ra | 1900 |
| 235Th | 145 | 235.0473 | 44,018.0 | --- | 7.2 m | (1/2+) | β⁻→235Pa(100%) | 1969 |
| 236Th | 146 | 236.0497 | 46,255.0 | --- | 37.3 m | 0+ | β⁻→236Pa(100%) | 1973 |
| 237Th | 147 | 237.0536 | 49,955.0 | --- | 4.8 m | (5/2+) | β⁻→237Pa(100%) | 1993 |
| 238Th | 148 | 238.0564 | 52,530.0 | --- | 9.4 m | 0+ | β⁻→238Pa(100%) | 1999 |
| 239Th | 149 | 239.0607 | 56,500.0 | --- | 1.0 m | (7/2+) | β⁻→239Pa | --- |