Isotopes of Radium (Z=88)

Click on an isotope to get more information about its decay
Isotope Half-life Spin Parity Decay Mode(s) or Abundance
202Ra 0.7 ms 0+ %A=100
203Ra 1.0 ms (3/2-) %A ~ 100
203m1Ra 33 ms (13/2+) %A ~ 100
204Ra 59 ms 0+ %A ~ 100
205Ra 210 ms (3/2-) %A=?
205m1Ra 170 ms (13/2+) %A=?
206Ra 0.24 s 0+ %A ~ 100
207Ra 1.3 s (5/2,3/2)- %A ~ 90, %EC+%B+ ~ 10
207m1Ra 55 ms(13/2+) %IT=85 sys%A=15 sys %EC+%B+ ~ 0.55
208Ra 1.3 s 0+ %A=95 sys %EC+%B+=5 sys
209Ra 4.6 s 5/2- %A ~ 90, %EC+%B+ ~ 10
210Ra 3.7 s0+ %A ~ 96, %EC+%B+ ~ 4
211Ra 13 s 5/2(-) %A > 93, %EC < 7
212Ra 13.0 s 0+ %A ~ 85, %EC+%B+ ~ 15
213Ra 2.74 m 1/2- %A=80 5, %EC+%B+=20 5
213m1Ra 2.1 ms %IT ~ 99, %A ~ 1
214Ra 2.46 s 0+ %A=99.941 4, %EC=0.059 4
215Ra 1.59 ms (9/2+) %A=100
216Ra 182 ns 0+ %A=100, %EC<1E-8
217Ra 1.6 us (9/2+) %A=100
218Ra 25.6 us 0+ %A=100
219Ra 10 ms (7/2)+ %A=100
220Ra 18 ms 0+ %A=100
221Ra 28 s5/2+ %A=100, %C=1.2E-10 9
222Ra 38.0 s 0+ %A=100, %14C=3.0E-8 10
223Ra 11.435 d 3/2+ %A=100, %14C=6.4E-8 4
224Ra 3.66 d 0+ %A=100, %14C=4.3E-9 12
225Ra 14.9 d 1/2+ %B-=100
226Ra 1600 y 0+ %A=100, %14C=3.2E-9 16
227Ra 42.2 m3/2+ %B-=100
228Ra 5.75 y 0+ %B-=100
229Ra 4.0 m 5/2(+) %B-=100
230Ra 93 m 0+ %B-=100
231Ra 103 s (7/2-,1/2+) %B-=100
232Ra 250 s 0+ %B-=100
233Ra 30 s %B-=100
234Ra 30 s 0+ %B-=100
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory
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