Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Naturally Occurring Isotopes
Dubnium has no naturally occurring isotopes.
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 255 | 1.6 seconds | Alpha Decay | 80.00% |
| Spontaneous Fission | ~ 20.00% | ||
| 256 | 1.9 seconds | Alpha Decay | ~ 70.00% |
| Electron Capture | ~ 30.00% | ||
| Spontaneous Fission | ~ 0.02% | ||
| 257 | 1.82 seconds | Alpha Decay | 94.00% |
| Spontaneous Fission | ~ 6.00% | ||
| 257m | 0.58 seconds | Alpha Decay | 100.00% |
| Spontaneous Fission | No Data Available | ||
| 258 | 4.2 seconds | Spontaneous Fission | < 1.00% |
| Alpha Decay | 65.00% | ||
| Electron Capture | 35.00% | ||
| 258m | 20 seconds | Electron Capture | 100.00% |
| 259 | 0.51 seconds | Alpha Decay | No Data Available |
| 260 | 1.52 seconds | Alpha Decay | >= 90.40% |
| Spontaneous Fission | <= 9.60% | ||
| Electron Capture | < 2.50% | ||
| 261 | 1.8 seconds | Alpha Decay | >= 82.00% |
| Spontaneous Fission | <= 18.00% | ||
| 262 | 35 seconds | Alpha Decay | ~ 67.00% |
| Spontaneous Fission | No Data Available | ||
| 263 | 27 seconds | Spontaneous Fission | 55.00% |
| Alpha Decay | 41.00% | ||
| Electron Capture | 3.00% | ||
| 264 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 265 | No Data Available | Alpha Decay (suspected) | No Data Available |
| 266 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Spontaneous Fission (suspected) | No Data Available | ||
| 267 | 73 minutes | Spontaneous Fission | 100.00% |
| 268 | 32 hours | Spontaneous Fission | 100.00% |
| 269 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Spontaneous Fission (suspected) | No Data Available | ||
| 270 | 23 hours | Spontaneous Fission | 100.00% |
| Alpha Decay | No Data Available |
This page is maintained by Steve Gagnon.