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 |
| 267 | 2.8 microseconds | Alpha Decay | 100.00% |
| 268 | No Data Available | Alpha Decay | No Data Available |
| 269 | 179 microseconds | Alpha Decay | 100.00% |
| 270 | 0.10 milliseconds | Alpha Decay | 100.00% |
| Spontaneous Fission | < 0.20% | ||
| 270m | 6.0 milliseconds | Alpha Decay | > 70.00% |
| Isomeric Transition | <= 30.00% | ||
| 271 | 1.63 milliseconds | Alpha Decay | 100.00% |
| 271m | 69 milliseconds | Alpha Decay | > 0.00% |
| Isomeric Transition (suspected) | No Data Available | ||
| 272 | No Data Available | Spontaneous Fission | No Data Available |
| 273 | 0.17 milliseconds | Alpha Decay | 100.00% |
| 274 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 275 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 276 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 277 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 278 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 279 | 0.18 seconds | Spontaneous Fission | ~ 90.00% |
| Alpha Decay | ~ 10.00% | ||
| 280 | No Data Available | No Data Available | No Data Available |
| 281 | 20 seconds | Spontaneous Fission | 85.00% |
| Alpha Decay | 15.00% | ||
| 281m | 9.6 seconds | Spontaneous Fission | 100.00% |
This page is maintained by Steve Gagnon.