Isotopes of Actinium (Z=89)
| Isotope |
Half-life |
Spin Parity |
Decay Mode(s) or Abundance |
| 206Ac |
22 ms |
(3+) |
%A=? |
| 206m1Ac |
33 ms |
(10-) |
|
| 207Ac |
22 ms |
(9/2-) |
%A ~ 100 |
| 208Ac |
95 ms |
(3+) |
%A=? |
| 208m1Ac |
25 ms |
(10-) |
%A=? |
| 209Ac |
0.10 s |
(9/2-) |
%A ~ 99, %EC+%B+ ~ 1 |
| 210Ac |
0.35 s |
|
%A ~ 96, %EC+%B+ ~ 4 |
|
|
| 211Ac |
0.25 s |
|
%A ~ 100 |
| 212Ac |
0.93 s |
|
%A ~ 97, %EC+%B+ ~ 3 |
| 213Ac |
0.80 s |
|
%A < 100 |
| 214Ac |
8.2 s |
|
%A > 89 3, %EC < 11 3 |
| 215Ac |
0.17 s |
9/2- |
%A=99.91 2, %EC+%B+=0.09 2 |
| 216Ac |
0.33 ms |
(1-) |
%A=100 |
| 216m1Ac |
0.33 ms |
(9-) |
|
| 217Ac |
69 ns |
9/2- |
%A=100, %EC+%B+ < 2 |
| 217m1Ac |
740 ns |
(29/2)+ |
|
| 218Ac |
1.08 us |
(1-) |
%A=100 |
| 219Ac |
11.8 us |
9/2- |
%A=100, %EC+%B+ ~ 1E-6 |
| 220Ac |
26.4 ms |
(3-) |
%A=100 |
| 221Ac |
52 ms |
(3/2-) |
%A=100 |
| 222Ac |
5.0 s |
1- |
%A=99 1, %EC+%B+=1 1 |
| 222m1Ac |
63 s |
|
%A > 88, %IT < 10 , %EC+%B+ < 2 |
| 223Ac |
2.10 m |
(5/2-) |
%A=99, %EC=1 |
| 224Ac |
2.78 h |
0- |
%EC=90.9 +14-20, %A=9.1 +20-14, %B- < 1.6 sys |
| 225Ac |
10.0 d |
(3/2-) |
%A=100, %14C=6.0E-10 13 |
| 226Ac |
29.37 h |
(1) |
%A=6E-3 2 , %B-=83 3 , %EC=17 3 |
| 227Ac |
21.773 y |
3/2- |
%B-=98.620 4, %A=1.380 4 |
| 228Ac |
6.15 h |
3+ |
%B-=100 |
| 229Ac |
62.7 m |
(3/2+) |
%B-=100 |
| 230Ac |
122 s |
(1+) |
%B-=100 |
| 231Ac |
7.5 m |
(1/2+) |
%B-=100 |
| 232Ac |
119 s |
(1+) |
%B-=100 |
| 233Ac |
145 s |
(1/2+) |
%B-=100 |
| 234Ac |
44 s |
|
%B-=100 |
| 235Ac |
|
|
|
| 236Ac |
|
|
|
Last Updated on
February 5, 2024
