Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
All Known Isotopes of the Element Seaborgium
| Mass Number | | Half-life | | Decay Mode | | Branching Percentage | | | 258 | | 2.9 milliseconds | | Spontaneous Fission | | <= 100.00 | | | | | | Alpha Decay | | No Data Available | | | 259 | | 0.48 seconds | | Alpha Decay | | 90.00 | | | | | | Spontaneous Fission | | < 20.00 | | | 260 | | 3.6 milliseconds | | Alpha Decay | | 50.00 | | | | | | Spontaneous Fission | | 50.00 | | | 261 | | 0.23 seconds | | Alpha Decay | | ~ 100.00 | | | | | | Spontaneous Fission | | < 1.00 | | | 262 | | 6.9 milliseconds | | Spontaneous Fission | | >= 78.00 | | | | | | Alpha Decay | | <= 22.00 | | | 263 | | 1.0 seconds | | Alpha Decay | | > 70.00 | | | | | | Spontaneous Fission | | < 30.00 | | | 263m | | 0.12 seconds | | Alpha Decay | | No Data Available | | | | | | Isomeric Transition | | No Data Available | | | 264 | | No Data Available | | No Data Available | | No Data Available | | | 265 | | 8 seconds | | Spontaneous Fission | | <= 57.00 | | | | | | Alpha Decay | | >= 43.00 | | | 266 | | 21 seconds | | Spontaneous Fission | | > 50.00 | | | | | | Alpha Decay | | > 18.00 | | | 269 | | 22 seconds | | Alpha Decay | | < 100.00 | | | | | | Spontaneous Fission | | No Data Available | | | 271 | | 1.9 minutes | | Alpha Decay | | 70.00 | | | | | | Spontaneous Fission | | 30.00 | |
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