Table
| nuclide symbol |
historic name |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
representative isotopic composition (mole fraction) |
range of natural variation (mole fraction) |
|---|---|---|---|---|---|---|---|---|---|---|
| excitation energy | ||||||||||
| 206Ac | 89 | 117 | 206.01450(8) | 25(7) ms | (3+) | |||||
| 206m1Ac | 80(50) keV | 15(6) ms | ||||||||
| 206m2Ac | 290(110)# keV | 41(16) ms | (10-) | |||||||
| 207Ac | 89 | 118 | 207.01195(6) | 31(8) ms |
α | 203Fr | 9/2-# | |||
| 208Ac | 89 | 119 | 208.01155(6) | 97(16) ms |
α (99%) | 204Fr | (3+) | |||
| β+ (1%) | 208Ra | |||||||||
| 208mAc | 506(26) keV | 28(7) ms |
α (89%) | 204Fr | (10-) | |||||
| IT (10%) | 208Ac | |||||||||
| β+ (1%) | 208Ra | |||||||||
| 209Ac | 89 | 120 | 209.00949(5) | 92(11) ms | α (99%) | 205Fr | (9/2-) | |||
| β+ (1%) | 209Ra | |||||||||
| 210Ac | 89 | 121 | 210.00944(6) | 350(40) ms | α (96%) | 206Fr | 7+# | |||
| β+ (4%) | 210Ra | |||||||||
| 211Ac | 89 | 122 | 211.00773(8) | 213(25) ms | α (99.8%) | 207Fr | 9/2-# | |||
| β+ (.2%) | 211Ra | |||||||||
| 212Ac | 89 | 123 | 212.00781(7) | 920(50) ms | α (97%) | 208Fr | 6+# | |||
| β+ (3%) | 212Ra | |||||||||
| 213Ac | 89 | 124 | 213.00661(6) | 731(17) ms | α | 209Fr | (9/2-)# | |||
| β+ (rare) | 213Ra | |||||||||
| 214Ac | 89 | 125 | 214.006902(24) | 8.2(2) s | α (89%) | 210Fr | (5+)# | |||
| β+ (11%) | 214Ra | |||||||||
| 215Ac | 89 | 126 | 215.006454(23) | 0.17(1) s | α (99.91%) | 211Fr | 9/2- | |||
| β+ (.09%) | 215Ra | |||||||||
| 216Ac | 89 | 127 | 216.008720(29) | 0.440(16) ms | α | 212Fr | (1-) | |||
| β+ (7×10−5%) | 216Ra | |||||||||
| 216mAc | 44(7) keV | 443(7) µs | (9-) | |||||||
| 217Ac | 89 | 128 | 217.009347(14) | 69(4) ns | α (98%) | 213Fr | 9/2- | |||
| β+ (2%) | 217Ra | |||||||||
| 217mAc | 2012(20) keV | 740(40) ns | (29/2)+ | |||||||
| 218Ac | 89 | 129 | 218.01164(5) | 1.08(9) µs | α | 214Fr | (1-)# | |||
| 218mAc | 584(50)# keV | 103(11) ns | (11+) | |||||||
| 219Ac | 89 | 130 | 219.01242(5) | 11.8(15) µs | α | 215Fr | 9/2- | |||
| β+ (10−6%) | 219Ra | |||||||||
| 220Ac | 89 | 131 | 220.014763(16) | 26.36(19) ms | α | 216Fr | (3-) | |||
| β+ (5×10−4%) | 220Ra | |||||||||
| 221Ac | 89 | 132 | 221.01559(5) | 52(2) ms | α | 217Fr | 9/2-# | |||
| 222Ac | 89 | 133 | 222.017844(6) | 5.0(5) s | α (99%) | 218Fr | 1- | |||
| β+ (1%) | 222Ra | |||||||||
| 222mAc | 200(150)# keV | 1.05(7) min | α (88.6%) | 218Fr | high | |||||
| IT (10%) | 222Ac | |||||||||
| β+ (1.4%) | 222Ra | |||||||||
| 223Ac | 89 | 134 | 223.019137(8) | 2.10(5) min | α (99%) | 219Fr | (5/2-) | |||
| EC (1%) | 223Ra | |||||||||
| CD (3.2×10−9%) | 209Bi 14C |
|||||||||
| 224Ac | 89 | 135 | 224.021723(4) | 2.78(17) h | β+ (90.9%) | 224Ra | 0- | |||
| α (9.1%) | 220Fr | |||||||||
| β- (1.6%) | 224Th | |||||||||
| 225Ac | 89 | 136 | 225.023230(5) | 10.0(1) d | α | 221Fr | (3/2-) | |||
| CD (6×10−10%) | 211Bi 14C |
|||||||||
| 226Ac | 89 | 137 | 226.026098(4) | 29.37(12) h | β- (83%) | 226Th | (1)(-#) | |||
| EC (17%) | 226Ra | |||||||||
| α (.006%) | 222Fr | |||||||||
| 227Ac | Actinium | 89 | 138 | 227.0277521(26) | 21.772(3) a | β- (98.61%) | 227Th | 3/2- | Trace | |
| α (1.38%) | 223Fr | |||||||||
| 228Ac | Mesothorium 2 | 89 | 139 | 228.0310211(27) | 6.15(2) h | β- | 228Th | 3+ | Trace | |
| α (5.5×10−6%) | 224Fr | |||||||||
| 229Ac | 89 | 140 | 229.03302(4) | 62.7(5) min | β- | 229Th | (3/2+) | |||
| 230Ac | 89 | 141 | 230.03629(32) | 122(3) s | β- | 230Th | (1+) | |||
| 231Ac | 89 | 142 | 231.03856(11) | 7.5(1) min | β- | 231Th | (1/2+) | |||
| 232Ac | 89 | 143 | 232.04203(11) | 119(5) s | β- | 232Th | (1+) | |||
| 233Ac | 89 | 144 | 233.04455(32)# | 145(10) s | β- | 233Th | (1/2+) | |||
| 234Ac | 89 | 145 | 234.04842(43)# | 44(7) s | β- | 234Th | ||||
| 235Ac | 89 | 146 | 235.05123(38)# | 40# s | β- | 235Th | 1/2+# | |||
| 236Ac | 89 | 147 | 236.05530(54)# | 2# min | β- | 236Th | ||||
Read more about this topic: Isotopes Of Actinium
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