| Isotopes of Californium | 
|  Notes | 
| Californium has no stable isotopes. | 
| Although californium does not occur naturally on Earth, the element and its decay products occur elsewhere in the universe. Their electromagnetic emissions are regularly observed in the spectra of supernovae. | 
|  Notable Isotopes  | 
|  248Cf [150 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 333.5 days | 
|  Decay Energy: ? MeV | 
|  Decays to ?. | 
|  Half life: 333.5 days [ Alpha Decay ] | 
|  Decay Energy: 6.361 MeV | 
|  Decays to 244Cm. | 
|  249Cf [151 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 351 years | 
|  Decay Energy: ? MeV | 
|  Decays to ?. | 
|  Half life: 351 years [ Alpha Decay ] | 
|  Decay Energy: 6.295 MeV | 
|  Decays to 245Cm. | 
|  250Cf [152 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 13.08 years [ Alpha Decay ] | 
|  Decay Energy: 6.128 MeV | 
|  Decays to 246Cm. | 
|  Half life: 13.08 years | 
|  Decay Energy: ? MeV | 
|  Decays to ?. | 
|  251Cf [153 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 898 years [ Alpha Decay ] | 
|  Decay Energy: 6.176 MeV | 
|  Decays to 247Cm. | 
|  252Cf [154 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 2.645 years [ Alpha Decay ] | 
|  Decay Energy: 6.217 MeV | 
|  Decays to 248Cm. | 
|  Half life: 2.645 years | 
|  Decay Energy: ? MeV | 
|  Decays to ?. | 
|  253Cf [155 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 17.81 days [ beta- ] | 
|  Decay Energy: 0.285 MeV | 
|  Decays to 253Es. | 
|  Half life: 17.81 days [ Alpha Decay ] | 
|  Decay Energy: 6.124 MeV | 
|  Decays to 249Cm. | 
|  254Cf [156 neutrons] | 
|  Abundance: synthetic | 
|  Half life: 60.5 days | 
|  Decay Energy: ? MeV | 
|  Decays to ?. | 
|  Half life: 60.5 days [ Alpha Decay ] | 
|  Decay Energy: 5.926 MeV | 
|  Decays to 250Cm. |