It's Elemental
Isotopes of the Element Osmium
Osmium
Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
Isotopes With A Known Natural Abundance
| Mass Number | Natural Abundance | Half-life |
| 184 | 0.02% | > 5.6×1013 years |
| 186 | 1.59% | 2.0×10+15 years |
| 187 | 1.96% | STABLE |
| 188 | 13.24% | STABLE |
| 189 | 16.15% | STABLE |
| 190 | 26.26% | STABLE |
| 192 | 40.78% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 161 | 0.64 milliseconds | Alpha Decay | 100.00% |
| 162 | 2.1 milliseconds | Alpha Decay | ~ 99.00% |
| 163 | 5.5 milliseconds | Alpha Decay | 100.00% |
| Electron Capture | No Data Available | ||
| 164 | 21 milliseconds | Alpha Decay | 98.00% |
| Electron Capture | 2.00% | ||
| 165 | 71 milliseconds | Electron Capture | < 40.00% |
| Alpha Decay | > 60.00% | ||
| 166 | 199 milliseconds | Alpha Decay | 72.00% |
| Electron Capture | 18.00% | ||
| 167 | 0.81 seconds | Alpha Decay | 57.00% |
| Electron Capture | 43.00% | ||
| 168 | 2.1 seconds | Electron Capture | 57.00% |
| Alpha Decay | 43.00% | ||
| 169 | 3.43 seconds | Electron Capture | 86.30% |
| Alpha Decay | 13.70% | ||
| 170 | 7.37 seconds | Alpha Decay | 9.50% |
| Electron Capture | 90.50% | ||
| 171 | 8.3 seconds | Electron Capture | 98.20% |
| Alpha Decay | 1.80% | ||
| 172 | 19.2 seconds | Electron Capture | 99.80% |
| Alpha Decay | 0.20% | ||
| 173 | 22.4 seconds | Electron Capture | No Data Available |
| Alpha Decay | 0.4% | ||
| 174 | 44 seconds | Electron Capture | 99.98% |
| Alpha Decay | 0.02% | ||
| 175 | 1.4 minutes | Electron Capture | 100.00% |
| 176 | 3.6 minutes | Electron Capture | 100.00% |
| 177 | 3.0 minutes | Electron Capture | 100.00% |
| 178 | 5.0 minutes | Electron Capture | 100.00% |
| Alpha Decay | No Data Available | ||
| 179 | 6.5 minutes | Electron Capture | 100.00% |
| 180 | 21.5 minutes | Electron Capture | 100.00% |
| 181 | 105 minutes | Electron Capture | 100.00% |
| 181m | 2.7 minutes | Electron Capture | 100.00% |
| Isomeric Transition | <= 3.00% | ||
| 182 | 21.84 hours | Electron Capture | 100.00% |
| 182m | 0.78 milliseconds | Isomeric Transition | 100.00% |
| 183 | 13.0 hours | Electron Capture | 100.00% |
| 183m | 9.9 hours | Electron Capture | 85.00% |
| Isomeric Transition | 15.00% | ||
| 184 | > 5.6×1013 years | Alpha Decay | No Data Available |
| 185 | 93.6 days | Electron Capture | 100.00% |
| 186 | 2.0×10+15 years | Alpha Decay | 100.00% |
| 187 | STABLE | - | - |
| 188 | STABLE | - | - |
| 189 | STABLE | - | - |
| 189m | 5.81 hours | Isomeric Transition | 100.00% |
| 190 | STABLE | - | - |
| 190m | 9.9 minutes | Isomeric Transition | 100.00% |
| 191 | 15.4 days | Beta-minus Decay | 100.00% |
| 191m | 13.10 hours | Isomeric Transition | 100.00% |
| 192 | STABLE | - | - |
| 192m | 5.9 seconds | Isomeric Transition | > 87.00% |
| Beta-minus Decay | < 13.00% | ||
| 193 | 30.11 hours | Beta-minus Decay | 100.00% |
| 194 | 6.0 years | Beta-minus Decay | 100.00% |
| 195 | ≈ 9 minutes | Beta-minus Decay | No Data Available |
| 196 | 34.9 minutes | Beta-minus Decay | 100.00% |
| 197 | 2.8 minutes | Beta-minus Decay | 100.00% |
| 198 | No Data Available | Beta-minus Decay | 100.00% |
| 199 | 5 seconds | Beta-minus Decay | 100.00% |
| 200 | 6 seconds | Beta-minus Decay | 100.00% |
| 201 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 202 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
Citation and linking information
For questions about this page, please contact Steve Gagnon.