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Isotopes of the Element Californium

[Click for Main Data]

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Naturally Occurring Isotopes

Californium has no naturally occurring isotopes.

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
2370.8 secondsSpontaneous Fission70.00%
Alpha Decay30.00%
23821 millisecondsSpontaneous Fission100.00%
23939 secondsElectron CaptureNo Data Available
Alpha DecayNo Data Available
24064 secondsAlpha Decay98.50%
Spontaneous Fission1.50%
2413.78 minutesElectron Capture~ 75.00%
Alpha Decay~ 25.00%
2423.7 minutesAlpha Decay80.00%
Electron Capture20.00%
Spontaneous Fission<= 0.01%
24310.7 minutesAlpha Decay~ 14.00%
Electron Capture~ 86.00%
24419.4 minutesAlpha Decay<= 100.00%
24545.0 minutesElectron Capture64.70%
Alpha Decay35.30%
24635.7 hoursAlpha Decay100.00%
Electron Capture< 4.0×10-3 %
Spontaneous Fission2.4×10-4 %
246m45 nanosecondsSpontaneous Fission<= 100.00%
2473.11 hoursElectron Capture99.97%
Alpha Decay0.04%
248333.5 daysAlpha Decay100.00%
Spontaneous Fission2.9×10-3 %
249351 yearsAlpha Decay100.00%
Spontaneous Fission5.0×10-7 %
25013.08 yearsAlpha Decay99.92%
Spontaneous Fission0.08%
251898 yearsAlpha Decay100.00%
Spontaneous FissionNo Data Available
2522.645 yearsAlpha Decay96.91%
Spontaneous Fission3.09%
25317.81 daysAlpha Decay0.31%
Beta-minus Decay99.69%
25460.5 daysSpontaneous Fission99.69%
Alpha Decay0.31%
25585 minutesBeta-minus Decay100.00%
25612.3 minutesSpontaneous Fission100.00%
Beta-minus Decay< 1.00%
Alpha Decay~ 1.0×10-6 %