Thorium Isotopic Data
Isotope |
Isotopic Mass amu |
% Abundance |
T1/2 |
T1/2 Units |
Mass Excess KeV |
Binding Energy Per Nucleon KeV |
Decay Mode |
Branching Ratio |
209Th | 209.01772 (11) |
| 7 | ms | 16,500 (100) | 7,655.5 (4.8) | A | ? |
210Th | 210.015075 (27) |
| 17 | ms | 14,043 (25) | 7,669.2 (1.2) | A | ? |
211Th | 211.014928 (80) |
| 48 | ms | 13,906 (75) | 7,671.7 (3.5) | A | ? |
212Th | 212.012980 (20) |
| 36 | ms | 12,091 (18) | 7,682.16 (8.7) | A~100 |
|
213Th | 213.013010 (76) |
| 140 | ms | 12,119 (71) | 7,683.9 (3.3) | A | ? |
214Th | 214.011500 (18) |
| 100 | ms | 10,712 (17) | 7,692.24 (7.9) | A~100 |
|
215Th | 215.011730 (29) |
| 1.2 | s | 10,927 (27) | 7,693.0 (1.2) | A | 100 |
216Th | 216.011062 (14) |
| 26.8 | ms | 10,304 (13) | 7,697.63 (6) | A~100 |
|
217Th | 217.013114 (22) |
| 240 | us | 12,216 (21) | 7,690.55 (9.6) | A | 100 |
218Th | 218.013284 (14) |
| 109 | ns | 12,374 (13) | 7,691.57 (5.9) | A | 100 |
219Th | 219.015537 (54) |
| 1.05 | us | 14,473 (51) | 7,683.7 (2.3) | A | 100 |
220Th | 220.015748 (24) |
| 9.7 | us | 14,669 (22) | 7,684.6 (1) | A | 100 |
221Th | 221.018184 (10) |
| 1.68 | ms | 16,938.0 (9.4) | 7,676.07 (4.2) | A | 100 |
222Th | 222.018468 (13) |
| 2.05 | ms | 17,203 (12) | 7,676.66 (5.5) | A | 100 |
223Th | 223.0208114 (99) |
| 600 | ms | 19,385.7 (9.2) | 7,668.64 (4.1) | A | 100 |
224Th | 224.021467 (12) |
| 1.05 | s | 19,996 (11) | 7,667.71 (4.9) | A | 100 |
225Th | 225.0239510 (55) |
| 8.72 | m | 22,310.2 (5.1) | 7,659.22 (2.3) | A~90 |
|
226Th | 226.0249031 (51) |
| 30.57 | m | 23,197.1 (4.7) | 7,657.12 (2.1) | A | 100 |
227Th | 227.0277041 (27) |
| 18.68 | d | 25,806.2 (2.5) | 7,647.45 (1.1) | A | 100 |
228Th | 228.0287411 (24) |
| 1.9116 | y | 26,772.2 (2.2) | 7,645.07 (1) | A | |
229Th | 229.0317624 (30) |
| 7.34 | ky | 29,586.5 (2.8) | 7,634.65 (1.2) | A | 100 |
230Th | 230.0331338 (19) |
| 75.38 | ky | 30,864.0 (1.8) | 7,630.990 (8) | A | 100 |
231Th | 231.0363043 (19) |
| 25.52 | h | 33,817.3 (1.8) | 7,620.112 (8) | B- | 100 |
232Th | 232.0380553 (21) | 100 | 14.05 | Gy | 35,448.3 (2) | 7,615.026 (9) |
|
|
233Th | 233.0415818 (21) |
| 22.3 | m | 38,733.2 (2) | 7,602.886 (9) | B- | 100 |
234Th | 234.0436012 (38) |
| 24.1 | d | 40,614.3 (3.5) | 7,596.85 (1.5) | B- | 100 |
235Th | 235.047510 (54) |
| 7.2 | m | 44,255 (50) | 7,583.4 (2.1) | B- | 100 |
236Th | 236.04987 (21) |
| 37.5 | m | 46,450 (200) | 7,576 (1) | B- | 100 |
237Th | 237.05389 (39) |
| 4.8 | m | 50,200 (360) | 7,562 (2) | B- | 100 |
238Th | 238.05650 (30) |
| 9.4 | m | 52,630 (280) | 7,554 (1) | B- | 100 |
216mTh | 216.011062 (14) |
| 137 | us | 10,304 (13) | 7,697.63 (6) | IT | 94 4 |
229mTh | 229.0317624 (30) |
| 70 | h | 29,586.5 (2.8) | 7,634.65 (1.2) | IT ? |
|
216m1Th | 216.011062 (14) |
| 615 | ns | 10,304 (13) | 7,697.63 (6) | IT | 100 |
Data Source: ENSDF March 2005
©Radiochemistry Society 2005