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