Most of the isotope data on this site has been obtained from the National Nuclear Data Center.
Naturally Occurring Isotopes
| Mass Number | Natural Abundance | Half-life |
| 180 | 0.01201% | > 1.2×10+15 years |
| 180 | 0.01201% | 1.2×10+15 years |
| 181 | 99.98799% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 155 | 2.9 milliseconds | Proton Emission | 100.00% |
| 156 | 144 milliseconds | Electron Capture | No Data Available |
| Proton Emission | 100.00% | ||
| 156m | 0.36 seconds | Electron Capture | 95.80% |
| Proton Emission | 4.20% | ||
| 157 | 10.1 milliseconds | Alpha Decay | 96.60% |
| Proton Emission | 3.40% | ||
| 157m | 4.3 milliseconds | Alpha Decay | 100.00% |
| 157m1 | 1.7 milliseconds | Alpha Decay | 100.00% |
| 158 | 55 milliseconds | Alpha Decay | ~ 91.00% |
| Electron Capture | ~ 9.00% | ||
| 158m | 36.7 milliseconds | Alpha Decay | 95.00% |
| Electron Capture | 5.00% | ||
| 159 | 0.83 seconds | Electron Capture | 66.00% |
| Alpha Decay | 34.00% | ||
| 159m | 0.56 seconds | Alpha Decay | 55.00% |
| Electron Capture | 45.00% | ||
| 160 | 1.55 seconds | Electron Capture | 66.00% |
| Alpha Decay | 34.00% | ||
| 160m | 1.7 seconds | No Data Available | No Data Available |
| 161 | No Data Available | Electron Capture | No Data Available |
| Alpha Decay | No Data Available | ||
| 161m | 3.08 seconds | Electron Capture | No Data Available |
| Alpha Decay | No Data Available | ||
| 162 | 3.57 seconds | Electron Capture | 99.93% |
| Alpha Decay | 0.07% | ||
| 163 | 10.6 seconds | Electron Capture | ~ 99.80% |
| Alpha Decay | ~ 0.20% | ||
| 164 | 14.2 seconds | Electron Capture | 100.00% |
| 165 | 31.0 seconds | Electron Capture | 100.00% |
| 166 | 34.4 seconds | Electron Capture | 100.00% |
| 167 | 80 seconds | Electron Capture | 100.00% |
| 168 | 2.0 minutes | Electron Capture | 100.00% |
| 169 | 4.9 minutes | Electron Capture | 100.00% |
| 170 | 6.76 minutes | Electron Capture | 100.00% |
| 171 | 23.3 minutes | Electron Capture | 100.00% |
| 172 | 36.8 minutes | Electron Capture | 100.00% |
| 173 | 3.14 hours | Electron Capture | 100.00% |
| 174 | 1.14 hours | Electron Capture | 100.00% |
| 175 | 10.5 hours | Electron Capture | 100.00% |
| 176 | 8.09 hours | Electron Capture | 100.00% |
| 177 | 56.56 hours | Electron Capture | 100.00% |
| 178 | 9.31 minutes | Electron Capture | 100.00% |
| 178m | 2.36 hours | Electron Capture | 100.00% |
| 178m1 | 58 milliseconds | Isomeric Transition | 100.00% |
| 178m2 | 290 milliseconds | Isomeric Transition | 100.00% |
| 179 | 1.82 years | Electron Capture | 100.00% |
| 179m | 9.0 milliseconds | Isomeric Transition | 100.00% |
| 179m1 | 54.1 milliseconds | Isomeric Transition | 100.00% |
| 180 | 8.154 hours | Electron Capture | 86.00% |
| Beta-minus Decay | 14.00% | ||
| 180m | 1.2×10+15 years | Electron Capture (suspected) | No Data Available |
| 180m1 | > 1.2×10+15 years | Beta-minus Decay (suspected) | No Data Available |
| 181 | STABLE | - | - |
| 182 | 114.74 days | Beta-minus Decay | 100.00% |
| 182m | 283 milliseconds | Isomeric Transition | 100.00% |
| 182m1 | 15.84 minutes | Isomeric Transition | 100.00% |
| 183 | 5.1 days | Beta-minus Decay | 100.00% |
| 184 | 8.7 hours | Beta-minus Decay | 100.00% |
| 185 | 49.4 minutes | Beta-minus Decay | 100.00% |
| 185m | > 1 milliseconds | No Data Available | No Data Available |
| 186 | 10.5 minutes | Beta-minus Decay | 100.00% |
| 186m | 1.54 minutes | Beta-minus Decay | 100.00% |
| 187 | 2.3 minutes | Beta-minus Decay | 100.00% |
| 187m | 22 seconds | Beta-minus Decay (suspected) | No Data Available |
| Isomeric Transition (suspected) | No Data Available | ||
| 187m1 | > 5 minutes | Beta-minus Decay (suspected) | No Data Available |
| 187m2 | 5 minutes | Isomeric Transition (suspected) | No Data Available |
| 188 | 19.6 seconds | Beta-minus Decay | No Data Available |
| 189 | 1.6 microseconds | Beta-minus Decay (suspected) | No Data Available |
| 190 | 5.3 seconds | Beta-minus Decay | 100.00% |
| 191 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 192 | 2.2 seconds | Beta-minus Decay | 100.00% |
This page is maintained by Steve Gagnon.