Actinium Isotopic Data
Isotope |
Isotopic Mass amu |
% Abundance |
T1/2 |
T1/2 Units |
Mass Excess KeV |
Binding Energy Per Nucleon KeV |
Decay Mode |
Branching Ratio |
206Ac | 206.014505 (76) |
| 25 | ms | 13,511 (70) | 7,667.7 (3.4) | A~100 |
|
207Ac | 207.011950 (56) |
| 31 | ms | 11,131 (52) | 7,681.2 (2.5) | A | 100 |
208Ac | 208.011552 (60) |
| 97 | ms | 10,760 (56) | 7,684.8 (2.7) | A | ? |
209Ac | 209.009495 (54) |
| 92 | ms | 8,844 (51) | 7,695.8 (2.4) | A | ? |
210Ac | 210.009436 (62) |
| 350 | ms | 8,790 (57) | 7,697.9 (2.7) | A | ? |
211Ac | 211.007735 (76) |
| 213 | ms | 7,205 (71) | 7,707.2 (3.4) | A~100 |
|
212Ac | 212.007814 (73) |
| 920 | ms | 7,279 (68) | 7,708.5 (3.2) | A | ? |
213Ac | 213.006608 (56) |
| 731 | ms | 6,155 (52) | 7,715.5 (2.4) | A | ? |
214Ac | 214.006902 (24) |
| 8.2 | s | 6,429 (22) | 7,715.9 (1) | A GE 89 3 |
|
215Ac | 215.006454 (23) |
| 170 | ms | 6,012 (21) | 7,719.5 (1) | A~100 |
|
216Ac | 216.008720 (29) |
| 440 | us | 8,123 (27) | 7,711.4 (1.2) | A | 100 |
217Ac | 217.009347 (14) |
| 69 | ns | 8,707 (13) | 7,710.32 (5.9) | A | ? |
218Ac | 218.011641 (54) |
| 1.08 | us | 10,844 (51) | 7,702.2 (2.3) | A | 100 |
219Ac | 219.012420 (54) |
| 11.8 | us | 11,570 (50) | 7,700.5 (2.3) | A | 100 |
220Ac | 220.014763 (16) |
| 26.36 | ms | 13,752 (15) | 7,692.32 (6.8) | A | 100 |
221Ac | 221.015591 (54) |
| 52 | ms | 14,523 (50) | 7,690.5 (2.3) | A | 100 |
222Ac | 222.0178439 (56) |
| 5 | s | 16,621.4 (5.2) | 7,682.80 (2.3) | A | 99 1 |
223Ac | 223.0191375 (77) |
| 2.1 | m | 17,826.4 (7.2) | 7,679.14 (3.2) | A | 99 |
224Ac | 224.0217229 (45) |
| 2.78 | h | 20,234.7 (4.2) | 7,670.14 (1.9) | B+ | 90.6 17 |
225Ac | 225.0232296 (50) |
| 10 | d | 21,638.2 (4.7) | 7,665.69 (2.1) | A | |
226Ac | 226.0260981 (36) |
| 29.37 | h | 24,310.2 (3.3) | 7,655.66 (1.5) | B- | 83 3 |
227Ac | 227.0277521 (26) |
| 21.772 | y | 25,850.9 (2.4) | 7,650.70 (1.1) | B- | 98.62 36 |
228Ac | 228.0310211 (27) |
| 6.15 | h | 28,896.0 (2.5) | 7,639.19 (1.1) | B- | 100 |
229Ac | 229.033015 (36) |
| 62.7 | m | 30,754 (33) | 7,633.0 (1.5) | B- | 100 |
230Ac | 230.03629 (32) |
| 122 | s | 33,810 (300) | 7,622 (1.3) | B- | 100 |
231Ac | 231.03856 (11) |
| 7.5 | m | 35,920 (100) | 7,614.4 (4.3) | B- | 100 |
232Ac | 232.04203 (11) |
| 119 | s | 39,150 (100) | 7,602.5 (4.3) | B- | 100 |
233Ac | 233.04455 (32) |
| 145 | s | 41,500 (300) | 7,594 (1) | B- | 100 |
234Ac | 234.04842 (43) |
| 44 | s | 45,100 (400) | 7,581 (2) | B- | 100 |
235Ac | 235.05123 (38) |
| 40 | s | 47,720 (360) | 7,572 (2) | B- ? |
|
236Ac | 236.05530 (54) |
| 2 | m | 51,510 (500) | 7,558 (2) | B- ? |
|
206mAc | 206.014505 (76) |
| 15 | ms | 13,511 (70) | 7,667.7 (3.4) | A~100 |
|
208mAc | 208.011552 (60) |
| 28 | ms | 10,760 (56) | 7,684.8 (2.7) | A | ? |
216mAc | 216.008720 (29) |
| 443 | us | 8,123 (27) | 7,711.4 (1.2) | A | 100 |
217mAc | 217.009347 (14) |
| 740 | ns | 8,707 (13) | 7,710.32 (5.9) | IT | 95.7 10 |
218mAc | 218.011641 (54) |
| 32 | ns | 10,844 (51) | 7,702.2 (2.3) | 0 |
|
222mAc | 222.0178439 (56) |
| 1.05 | m | 16,621.4 (5.2) | 7,682.80 (2.3) | A | ? |
206m1Ac | 206.014505 (76) |
| 41 | ms | 13,511 (70) | 7,667.7 (3.4) | A~100 |
|
218m1Ac | 218.011641 (54) |
| 103 | ns | 10,844 (51) | 7,702.2 (2.3) | 0 |
|
Data Source: ENSDF March 2005
©Radiochemistry Society 2005