Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Naturally Occurring Isotopes
Berkelium has no naturally occurring isotopes.
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 234 | 1.4×102 seconds | Alpha Decay | >= 80.00% |
| Electron Capture | <= 20.00% | ||
| 235 | No Data Available | Electron Capture (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 236 | No Data Available | No Data Available | No Data Available |
| 237 | 1 minutes | Alpha Decay (suspected) | No Data Available |
| Electron Capture (suspected) | No Data Available | ||
| 238 | 144 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Spontaneous Fission | 0.048% | ||
| 239 | No Data Available | Electron Capture | > 99.00% |
| Alpha Decay | < 1.00% | ||
| Spontaneous Fission | < 1.00% | ||
| 240 | 4.8 minutes | Electron Capture | No Data Available |
| Electron Capture with delayed Spontaneous Fission | 2.0×10-3 % | ||
| 241 | 4.6 minutes | Alpha Decay | No Data Available |
| Electron Capture | No Data Available | ||
| 242 | 7.0 minutes | Electron Capture | <= 100.00% |
| 243 | 4.5 hours | Electron Capture | ~ 99.85% |
| Alpha Decay | ~ 0.15% | ||
| 244 | 4.35 hours | Electron Capture | 99.99% |
| Alpha Decay | 6.0×10-3 % | ||
| 245 | 4.95 days | Electron Capture | 99.88% |
| Alpha Decay | 0.12% | ||
| 246 | 1.80 days | Electron Capture | 100.00% |
| 247 | 1380 years | Alpha Decay | <= 100.00% |
| 248 | > 9 years | Alpha Decay | No Data Available |
| 248m | 23.7 hours | Electron Capture | 30.00% |
| Beta-minus Decay | 70.00% | ||
| 249 | 330 days | Beta-minus Decay | 100.00% |
| Alpha Decay | 1.4×10-3 % | ||
| Spontaneous Fission | 4.7×10-8 % | ||
| 250 | 3.212 hours | Beta-minus Decay | 100.00% |
| 251 | 55.6 minutes | Beta-minus Decay | 100.00% |
| 252 | No Data Available | No Data Available | No Data Available |
| 253 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 254 | No Data Available | No Data Available | No Data Available |
This page is maintained by Steve Gagnon.