Isotopes of Thorium (Z=90)

Click on an isotope to get more information about its decay
Isotope Half-life Spin Parity Decay Mode(s) or Abundance
210Th 9 ms 0+ %A ~ 100
211Th 37 ms %A=?, %EC=?
212Th 30 ms 0+ %A=100, %EC+%B+ ~ 0.3
213Th 140 ms %A < 100
214Th 100 ms 0+ %A=100
215Th 1.2 s (1/2-) %A=100
216Th 0.028 s 0+ %A=100, %EC+%B+ ~ 0.01 sys
216m1Th 180 us (8+,11-)
217Th 0.252 ms(9/2+) %A=100
218Th 109 ns 0+ %A=100
219Th 1.05 us %A=100, %EC+%B+ ~ 1E-7
220Th 9.7 us 0+ %A=100, %EC=2E-7 sys
221Th 1.68 ms(7/2+) %A=100
222Th 2.8 ms 0+ %A=100
223Th 0.60 s (5/2)+ %A=100
224Th 1.05 s 0+ %A=100
225Th 8.72 m (3/2)+ %A ~ 90, %EC ~ 10
226Th 30.57 m 0+ %A=100
227Th 18.72 d(1/2+) %A=100
228Th 1.9116 y 0+ %A=100, %20O=1.13E-11 22
229Th 7340 y 5/2+ %A=100
230Th 7.538e+4 y 0+ %A=100, %24NE=5.6E-11 10, %SF < 3.8E-12
231Th 25.52 h5/2+ %B-=100, %A ~ 1E-8
232Th 1.405e10 y 0+ %Abundance=100, %A=100 , %SF<1.8E-9
233Th 22.3 m1/2+ %B-=100
234Th 24.10 d 0+ %B-=100
235Th 7.1 m (1/2+) %B-=100
236Th 37.5 m 0+ %B-=100
237Th 5.0 m %B-=100
238Th
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
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Lawrence Berkeley National Laboratory
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