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 |
| 263 | 0.74 milliseconds | Alpha Decay | <= 100.00% |
| Spontaneous Fission | < 8.40% | ||
| 264 | ≈ 0.8 milliseconds | Alpha Decay | ~ 50.00% |
| Spontaneous Fission | ~ 50.00% | ||
| 265 | 1.9 milliseconds | Alpha Decay | < 100.00% |
| Spontaneous Fission | <= 1.00% | ||
| 265m | 0.3 milliseconds | Alpha Decay | < 100.00% |
| 266 | 2.3 milliseconds | Alpha Decay | 100.00% |
| Spontaneous Fission | < 1.40% | ||
| 267 | 52 milliseconds | Alpha Decay | >= 80.00% |
| Spontaneous Fission | < 20.00% | ||
| 267m | 0.8 seconds | Alpha Decay | 100.00% |
| 268 | 0.4 seconds | Alpha Decay | No Data Available |
| 269 | 3.6 seconds | Alpha Decay | 100.00% |
| 269m | 9.7 seconds | Alpha Decay | 100.00% |
| 270 | 22 seconds | Alpha Decay | 100.00% |
| 271 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Spontaneous Fission (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 | No Data Available |
| 274 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 275 | 0.15 seconds | Alpha Decay | 100.00% |
| 276 | No Data Available | Spontaneous Fission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 277 | No Data Available | No Data Available | No Data Available |
This page is maintained by Steve Gagnon.