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 |
| 156 | 0.056% | STABLE |
| 158 | 0.095% | STABLE |
| 160 | 2.329% | STABLE |
| 161 | 18.889% | STABLE |
| 162 | 25.475% | STABLE |
| 163 | 24.896% | STABLE |
| 164 | 28.260% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 138 | No Data Available | Electron Capture (suspected) | No Data Available |
| 139 | 0.6 seconds | Electron Capture | No Data Available |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 140 | No Data Available | Electron Capture | No Data Available |
| 141 | 0.9 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 142 | 2.3 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.06% | ||
| 143 | 5.6 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 143m | 3.0 seconds | Electron Capture with delayed Proton Emission | No Data Available |
| Electron Capture | 100.00% | ||
| 144 | 9.1 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 145 | 6 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | ~ 50.00% | ||
| 145m | 14.1 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | ~ 50.00% | ||
| 146 | 29 seconds | Electron Capture | 100.00% |
| 146m | 150 milliseconds | Isomeric Transition | 100.00% |
| 147 | 67 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.05% | ||
| 147m | 55.2 seconds | Electron Capture | 68.90% |
| Isomeric Transition | 31.10% | ||
| 148 | 3.3 minutes | Electron Capture | 100.00% |
| 149 | 4.20 minutes | Electron Capture | 100.00% |
| 149m | 0.490 seconds | Isomeric Transition | 99.30% |
| Electron Capture | 0.70% | ||
| 150 | 7.17 minutes | Electron Capture | 64.00% |
| Alpha Decay | 36.00% | ||
| 151 | 17.9 minutes | Electron Capture | 94.40% |
| Alpha Decay | 5.60% | ||
| 152 | 2.38 hours | Electron Capture | 99.90% |
| Alpha Decay | 0.10% | ||
| 153 | 6.4 hours | Electron Capture | 99.99% |
| Alpha Decay | 9.4×10-3 % | ||
| 154 | 3.0×10+6 years | Alpha Decay | 100.00% |
| 155 | 9.9 hours | Electron Capture | 100.00% |
| 156 | STABLE | - | - |
| 157 | 8.14 hours | Electron Capture | 100.00% |
| 157m | 21.6 milliseconds | Isomeric Transition | 100.00% |
| 158 | STABLE | - | - |
| 159 | 144.4 days | Electron Capture | 100.00% |
| 160 | STABLE | - | - |
| 161 | STABLE | - | - |
| 162 | STABLE | - | - |
| 163 | STABLE | - | - |
| 164 | STABLE | - | - |
| 165 | 2.334 hours | Beta-minus Decay | 100.00% |
| 165m | 1.257 minutes | Isomeric Transition | 97.76% |
| Beta-minus Decay | 2.24% | ||
| 166 | 81.6 hours | Beta-minus Decay | 100.00% |
| 167 | 6.20 minutes | Beta-minus Decay | 100.00% |
| 168 | 8.7 minutes | Beta-minus Decay | 100.00% |
| 169 | 39 seconds | Beta-minus Decay | 100.00% |
| 170 | No Data Available | Beta-minus Decay | 100.00% |
| 171 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 172 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 173 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
This page is maintained by Steve Gagnon.