It's Elemental
Isotopes of the Element Einsteinium
Einsteinium
Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 240 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Electron Capture (suspected) | No Data Available | ||
| 241 | 8 seconds | Electron Capture | No Data Available |
| Alpha Decay | No Data Available | ||
| 242 | 17.8 seconds | Alpha Decay | 57.00% |
| Electron Capture | 43.00% | ||
| 243 | 23 seconds | Alpha Decay | 61.00% |
| Electron Capture | 39.00% | ||
| Spontaneous Fission | < 1.00% | ||
| 244 | 37 seconds | Electron Capture | 96.00% |
| Alpha Decay | 4.00% | ||
| 245 | 1.1 minutes | Electron Capture | 60.00% |
| Alpha Decay | 40.00% | ||
| 246 | 7.5 minutes | Alpha Decay | 9.90% |
| Electron Capture | 90.10% | ||
| 247 | 4.55 minutes | Electron Capture | ~ 93.00% |
| Alpha Decay | ~ 7.00% | ||
| 247m | 625 days | Alpha Decay | No Data Available |
| 248 | 27 minutes | Electron Capture | 99.70% |
| Alpha Decay | ~ 0.25% | ||
| 249 | 102.2 minutes | Electron Capture | 99.43% |
| Alpha Decay | 0.57% | ||
| 250 | 8.6 hours | Electron Capture | > 97.00% |
| Alpha Decay | < 3.00% | ||
| 250m | 2.22 hours | Electron Capture | <= 100.00% |
| 251 | 33 hours | Electron Capture | 99.50% |
| Alpha Decay | 0.50% | ||
| 252 | 471.7 days | Alpha Decay | 78.00% |
| Electron Capture | 22.00% | ||
| 253 | 20.47 days | Spontaneous Fission | 8.7×10-6 % |
| Alpha Decay | 100.00% | ||
| 254 | 275.7 days | Alpha Decay | 100.00% |
| Beta-minus Decay | 1.7×10-4 % | ||
| Spontaneous Fission | < 3.0×10-6 % | ||
| 254m | 39.3 hours | Alpha Decay | 0.32% |
| Electron Capture | 0.08% | ||
| Spontaneous Fission | < 0.05% | ||
| Beta-minus Decay | 98.00% | ||
| Isomeric Transition | < 3.00% | ||
| 255 | 39.8 days | Beta-minus Decay | 92.00% |
| Alpha Decay | 8.00% | ||
| Spontaneous Fission | 4.1×10-3 % | ||
| 256 | 25.4 minutes | Beta-minus Decay | 100.00% |
| 256m | 7.6 hours | Beta-minus Decay | 100.00% |
| 257 | 7.7 days | Beta-minus Decay | No Data Available |
| Spontaneous Fission | No Data Available | ||
| 258 | No Data Available | Alpha Decay (suspected) | No Data Available |
| Electron Capture (suspected) | No Data Available |
Citation and linking information
For questions about this page, please contact Steve Gagnon.