Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 248 | 2 microseconds | Spontaneous Fission (suspected) | No Data Available |
| 249 | No Data Available | No Data Available | No Data Available |
| 250 | 4.2 microseconds | Spontaneous Fission | 100.00% |
| Alpha Decay | < 2.00% | ||
| 251 | 0.80 seconds | Alpha Decay | 84.00% |
| Spontaneous Fission | < 0.30% | ||
| Electron Capture | No Data Available | ||
| 251m | 1.02 seconds | Alpha Decay | 100.00% |
| 252 | 2.47 seconds | Alpha Decay | 70.70% |
| Spontaneous Fission | 29.30% | ||
| Electron Capture | < 1.10% | ||
| 252m | 110 milliseconds | Isomeric Transition | 100.10% |
| 253 | 1.62 minutes | Electron Capture | No Data Available |
| Alpha Decay | ~ 80.00% | ||
| 254 | 51 seconds | Alpha Decay | 90.00% |
| Electron Capture | 10.00% | ||
| Spontaneous Fission | 0.17% | ||
| 254m | 0.28 seconds | Isomeric Transition | > 80.00% |
| 255 | 3.52 minutes | Electron Capture | 70.00% |
| Alpha Decay | 30.00% | ||
| 256 | 2.91 seconds | Alpha Decay | 99.47% |
| Spontaneous Fission | 0.53% | ||
| 257 | 25 seconds | Alpha Decay | <= 100.00% |
| Spontaneous Fission | <= 1.50% | ||
| 258 | 1.2 milliseconds | Spontaneous Fission | <= 100.00% |
| 259 | 58 minutes | Alpha Decay | 75.00% |
| Electron Capture | 25.00% | ||
| Spontaneous Fission | < 10.00% | ||
| 260 | 106 milliseconds | Spontaneous Fission | 100.00% |
| 261 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 262 | ≈ 5 milliseconds | Spontaneous Fission | 100.00% |
| 263 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Spontaneous Fission (suspected) | No Data Available | ||
| 264 | No Data Available | Alpha Decay (suspected) | No Data Available |
This page is maintained by Steve Gagnon.