Isotopes of Actinium (Z=89)
Click on an isotope to get more information about its decay
|
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
| |
|
|
|---|
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory