Isotopes of Californium (Z=98)

Click on an isotope to get more information about its decay
Isotope Half-life Spin Parity Decay Mode(s) or Abundance
237Cf 2.1 s %SF ~ 10 sys
238Cf 21 ms 0+ %SF ~ 100 sys
239Cf 39 s %A=?
240Cf 1.06 m 0+ %A=87 12, %SF ~ 13
241Cf 3.78 m %EC ~ 75, %A ~ 25
242Cf 3.49 m 0+ %A=65 10, %SF < 1.4E-2
243Cf 10.7 m(1/2+) %EC ~ 86, %A ~ 14
244Cf 19.4 m 0+ %A=70 20
245Cf 45.0 m(5/2+) %EC=64 3, %A=36 3
246Cf 35.7 h 0+ %A=99.9996 2, %SF=2.3E-4 8, %EC<5E-4
246m1Cf 45 ns
247Cf 3.11 h(7/2+) %EC=99.965 5, %A=0.035 5
248Cf 333.5 d 0+ %A=99.9971 3, %SF=0.0029 3
249Cf 351 y 9/2- %A=100, %SF=4.4E-7 5
250Cf 13.08 y 0+ %A=99.923 3, %SF=0.077 5
251Cf 898 y 1/2+ %A=100
252Cf 2.645 y 0+ %A=96.908 8, %SF=3.092 8
253Cf 17.81 d(7/2+) %B-=99.69 4, %A=0.31 4
254Cf 60.5 d 0+ %SF=99.69 2, %A=0.31 2
255Cf 85 m (9/2+) %B-=100
256Cf 12.3 m 0+ %SF=100, %B-<1 sys %A ~ 1E-6 sys
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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