It's Elemental
Isotopes of the Element Iridium
Iridium
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 |
| 191 | 37.3% | STABLE |
| 193 | 62.7% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 164 | 94 microseconds | Proton Emission | > 0.00% |
| Alpha Decay | No Data Available | ||
| Electron Capture | No Data Available | ||
| 165 | 1 microseconds | Proton Emission (suspected) | No Data Available |
| Alpha Decay (suspected) | No Data Available | ||
| 165m | 0.30 milliseconds | Alpha Decay | 13.00% |
| Proton Emission | 87.00% | ||
| 166 | 10.5 milliseconds | Alpha Decay | 93.00% |
| Proton Emission | 7.00% | ||
| 166m | 15.1 milliseconds | Alpha Decay | 98.20% |
| Proton Emission | 1.80% | ||
| 167 | 35.2 milliseconds | Alpha Decay | 48.00% |
| Proton Emission | 32.00% | ||
| Electron Capture | 20.00% | ||
| 167m | 25.7 milliseconds | Proton Emission | 0.40% |
| Alpha Decay | 80.00% | ||
| Electron Capture | 20.00% | ||
| 168 | 222 milliseconds | Alpha Decay | <= 100.00% |
| Electron Capture | No Data Available | ||
| Proton Emission | No Data Available | ||
| 168m | 159 milliseconds | Alpha Decay | 77.00% |
| Electron Capture | <= 23.00% | ||
| Proton Emission | No Data Available | ||
| 169 | 0.353 seconds | Alpha Decay | 45.00% |
| Electron Capture | No Data Available | ||
| Proton Emission | No Data Available | ||
| 169m | 0.281 seconds | Electron Capture | No Data Available |
| Proton Emission | No Data Available | ||
| Alpha Decay | 72.00% | ||
| 170 | 0.87 seconds | Electron Capture | 94.80% |
| Alpha Decay | 5.20% | ||
| 170m | 811 milliseconds | Isomeric Transition | <= 62.00% |
| Electron Capture | <= 62.00% | ||
| Alpha Decay | 38.00% | ||
| 171 | 3.2 seconds | Alpha Decay | > 0.00% |
| Proton Emission | No Data Available | ||
| Electron Capture | No Data Available | ||
| 171m | 1.40 seconds | Proton Emission | <= 42.00% |
| Electron Capture | <= 42.00% | ||
| Alpha Decay | 58.00% | ||
| 172 | 4.4 seconds | Electron Capture | 98.00% |
| Alpha Decay | ~ 2.00% | ||
| 172m | 2.0 seconds | Electron Capture | 77.00% |
| Alpha Decay | 23.00% | ||
| 173 | 9.0 seconds | Electron Capture | > 93.00% |
| Alpha Decay | < 7.00% | ||
| 173m | 2.4 seconds | Electron Capture | No Data Available |
| Alpha Decay | 7.00% | ||
| 174 | 7.9 seconds | Electron Capture | 99.50% |
| Alpha Decay | 0.50% | ||
| 174m | 4.9 seconds | Electron Capture | 97.50% |
| Alpha Decay | 2.50% | ||
| 175 | 9 seconds | Electron Capture | 99.15% |
| Alpha Decay | 0.85% | ||
| 176 | 8.7 seconds | Electron Capture | 96.90% |
| Alpha Decay | 3.10% | ||
| 177 | 30 seconds | Electron Capture | 99.94% |
| Alpha Decay | 0.06% | ||
| 178 | 12 seconds | Electron Capture | 100.00% |
| 179 | 79 seconds | Electron Capture | 100.00% |
| 180 | 1.5 minutes | Electron Capture | 100.00% |
| 181 | 4.90 minutes | Electron Capture | 100.00% |
| 182 | 15 minutes | Electron Capture | 100.00% |
| 183 | 57 minutes | Electron Capture | 100.00% |
| 184 | 3.09 hours | Electron Capture | 100.00% |
| 185 | 14.4 hours | Electron Capture | 100.00% |
| 186 | 16.64 hours | Electron Capture | 100.00% |
| 186m | 1.90 hours | Electron Capture | ~ 75.00% |
| Isomeric Transition | ~ 25.00% | ||
| 187 | 10.5 hours | Electron Capture | 100.00% |
| 187m | 30.3 milliseconds | Isomeric Transition | 100.00% |
| 188 | 41.5 hours | Electron Capture | 100.00% |
| 188m | 4.2 milliseconds | Electron Capture (suspected) | No Data Available |
| Isomeric Transition | No Data Available | ||
| 189 | 13.2 days | Electron Capture | 100.00% |
| 189m | 13.3 milliseconds | Isomeric Transition | 100.00% |
| 189m1 | 3.7 milliseconds | Isomeric Transition | 100.00% |
| 190 | 11.78 days | Electron Capture | 100.00% |
| 190m | 1.120 hours | Isomeric Transition | 100.00% |
| 190m1 | 3.087 hours | Isomeric Transition | 8.60% |
| Electron Capture | 91.40% | ||
| 191 | STABLE | - | - |
| 191m | 4.899 seconds | Isomeric Transition | 100.00% |
| 191m1 | 5.5 seconds | Isomeric Transition | 100.00% |
| 192 | 73.829 days | Beta-minus Decay | 95.24% |
| Electron Capture | 4.76% | ||
| 192m | 1.45 minutes | Isomeric Transition | 99.98% |
| Beta-minus Decay | 0.02% | ||
| 192m1 | 241 years | Isomeric Transition | 100.00% |
| 193 | STABLE | - | - |
| 193m | 10.53 days | Isomeric Transition | 100.00% |
| 194 | 19.28 hours | Beta-minus Decay | 100.00% |
| 194m | 31.85 milliseconds | Isomeric Transition | 100.00% |
| 194m1 | 171 days | Beta-minus Decay | 100.00% |
| 195 | 2.5 hours | Beta-minus Decay | 100.00% |
| 195m | 3.8 hours | Beta-minus Decay | 95.00% |
| Isomeric Transition | 5.00% | ||
| 196 | 52 seconds | Beta-minus Decay | 100.00% |
| 196m | 1.40 hours | Beta-minus Decay | 100.00% |
| Isomeric Transition | < 0.30% | ||
| 197 | 5.8 minutes | Beta-minus Decay | 100.00% |
| 197m | 8.9 minutes | Isomeric Transition | 0.25% |
| Beta-minus Decay | 99.75% | ||
| 198 | 8 seconds | Beta-minus Decay | 100.00% |
| 199 | 6 seconds | Beta-minus Decay | No Data Available |
| 200 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 201 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 202 | 11 seconds | Beta-minus Decay | 100.00% |
| 203 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 204 | No Data Available | No Data Available | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.