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 |
| 185 | 37.40% | STABLE |
| 187 | 62.60% | 4.33×10+10 years |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 159 | No Data Available | No Data Available | No Data Available |
| 160 | 0.82 milliseconds | Proton Emission | 91.00% |
| Alpha Decay | 9.00% | ||
| 161 | 0.44 milliseconds | Proton Emission | 100.00% |
| Alpha Decay | <= 1.40% | ||
| 161m | 14.7 milliseconds | Alpha Decay | 93.00% |
| Proton Emission | 7.00% | ||
| 162 | 107 milliseconds | Alpha Decay | 94.00% |
| Electron Capture | 6.00% | ||
| 162m | 77 milliseconds | Alpha Decay | 91.00% |
| Electron Capture | 9.00% | ||
| 163 | 390 milliseconds | Electron Capture | 68.00% |
| Alpha Decay | 32.00% | ||
| 163m | 214 milliseconds | Alpha Decay | 66.00% |
| Electron Capture | 34.00% | ||
| 164 | 0.85 seconds | Alpha Decay | ~ 58.00% |
| Electron Capture | ~ 42.00% | ||
| 164m | 0.86 seconds | Isomeric Transition | No Data Available |
| Alpha Decay | ~ 3.00% | ||
| 165 | ≈ 1 seconds | Electron Capture | No Data Available |
| Alpha Decay | No Data Available | ||
| 165m | 2.1 seconds | Electron Capture | 87.00% |
| Alpha Decay | 13.00% | ||
| 166 | 2.25 seconds | Electron Capture | > 76.00% |
| Alpha Decay | < 24.00% | ||
| 167 | 5.9 seconds | Electron Capture | ~ 99.00% |
| Alpha Decay | ~ 1.00% | ||
| 167m | 3.4 seconds | Alpha Decay | 100.00% |
| 168 | 4.4 seconds | Electron Capture | 100.00% |
| Alpha Decay | ~ 5.0×10-3 % | ||
| 169 | 8.1 seconds | Electron Capture | 100.00% |
| Alpha Decay | < 0.01% | ||
| 169m | 15.1 seconds | Electron Capture | No Data Available |
| Isomeric Transition | No Data Available | ||
| Alpha Decay | ~ 0.20% | ||
| 170 | 9.2 seconds | Electron Capture | 100.00% |
| 171 | 15.2 seconds | Electron Capture | 100.00% |
| 172 | 55 seconds | Electron Capture | 100.00% |
| 172m | 15 seconds | Electron Capture | 100.00% |
| 173 | 1.98 minutes | Electron Capture | 100.00% |
| 174 | 2.40 minutes | Electron Capture | 100.00% |
| 175 | 5.89 minutes | Electron Capture | 100.00% |
| 176 | 5.3 minutes | Electron Capture | 100.00% |
| 177 | 14 minutes | Electron Capture | 100.00% |
| 178 | 13.2 minutes | Electron Capture | 100.00% |
| 179 | 19.5 minutes | Electron Capture | 100.00% |
| 179m | 0.466 milliseconds | Isomeric Transition | 100.00% |
| 180 | 2.44 minutes | Electron Capture | 100.00% |
| 181 | 19.9 hours | Electron Capture | 100.00% |
| 182 | 64.0 hours | Electron Capture | 100.00% |
| 182m | 12.7 hours | Electron Capture | 100.00% |
| 183 | 70.0 days | Electron Capture | 100.00% |
| 183m | 1.04 milliseconds | Isomeric Transition | 100.00% |
| 184 | 35.4 days | Electron Capture | 100.00% |
| 184m | 169 days | Isomeric Transition | 74.50% |
| Electron Capture | 25.50% | ||
| 185 | STABLE | - | - |
| 186 | 3.7186 days | Beta-minus Decay | 92.53% |
| Electron Capture | 7.47% | ||
| 186m | 2.0×10+5 years | Isomeric Transition | 100.00% |
| 187 | 4.33×10+10 years | Beta-minus Decay | 100.00% |
| Alpha Decay | < 1.0×10-4 % | ||
| 188 | 17.003 hours | Beta-minus Decay | 100.00% |
| 188m | 18.59 minutes | Isomeric Transition | 100.00% |
| 189 | 24.3 hours | Beta-minus Decay | 100.00% |
| 190 | 3.1 minutes | Beta-minus Decay | 100.00% |
| 190m | 3.2 hours | Beta-minus Decay | 54.40% |
| Isomeric Transition | 45.60% | ||
| 191 | 9.8 minutes | Beta-minus Decay | 100.00% |
| 192 | 16 seconds | Beta-minus Decay | 100.00% |
| 193 | No Data Available | No Data Available | No Data Available |
| 194 | 5 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay | 100.00% | ||
| Beta-minus Decay | 100.00% | ||
| 195 | 6 seconds | Beta-minus Decay | No Data Available |
| 196 | 3 seconds | Beta-minus Decay | 100.00% |
| 198 | No Data Available | No Data Available | No Data Available |
This page is maintained by Steve Gagnon.