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 |
| 265 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 266 | 1.7 milliseconds | Alpha Decay | <= 100.00% |
| 267 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 268 | 21 milliseconds | Alpha Decay | 100.00% |
| 269 | No Data Available | No Data Available | No Data Available |
| 270 | 5.0 milliseconds | Alpha Decay | 100.00% |
| 271 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 272 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 273 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Spontaneous Fission (suspected) | No Data Available | ||
| 274 | 0.44 seconds | Alpha Decay | 100.00% |
| Spontaneous Fission | No Data Available | ||
| 275 | 9.7 milliseconds | Alpha Decay | 100.00% |
| 276 | 0.72 seconds | Alpha Decay | 100.00% |
| 277 | No Data Available | No Data Available | No Data Available |
| 278 | 8 seconds | Alpha Decay | 100.00% |
| Spontaneous Fission | No Data Available | ||
| 279 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available |
This page is maintained by Steve Gagnon.