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 |
| 151 | 47.81% | >= 1.7×10+18 years |
| 153 | 52.19% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 130 | 0.90 milliseconds | Proton Emission | 100.00% |
| 131 | 17.8 milliseconds | Proton Emission | 89.00% |
| Electron Capture | 11.00% | ||
| 132 | No Data Available | Proton Emission | No Data Available |
| Electron Capture | No Data Available | ||
| 133 | No Data Available | Electron Capture (suspected) | No Data Available |
| 134 | 0.5 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | > 0.00% | ||
| 135 | 1.5 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 136 | 3.3 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.09% | ||
| 136m | 3.8 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.09% | ||
| 137 | 11 seconds | Electron Capture | 100.00% |
| 138 | 12.1 seconds | Electron Capture | 100.00% |
| 139 | 17.9 seconds | Electron Capture | 100.00% |
| 140 | 1.51 seconds | Electron Capture | 100.00% |
| 140m | 125 milliseconds | Electron Capture | < 1.00% |
| Isomeric Transition | 100.00% | ||
| 141 | 40.7 seconds | Electron Capture | 100.00% |
| 141m | 2.7 seconds | Isomeric Transition | 87.00% |
| Electron Capture | 13.00% | ||
| 142 | 2.34 seconds | Electron Capture | 100.00% |
| 142m | 1.223 minutes | Electron Capture | 100.00% |
| 143 | 2.59 minutes | Electron Capture | 100.00% |
| 144 | 10.2 seconds | Electron Capture | 100.00% |
| 145 | 5.93 days | Electron Capture | 100.00% |
| 146 | 4.61 days | Electron Capture | 100.00% |
| 147 | 24.1 days | Electron Capture | 100.00% |
| Alpha Decay | 2.2×10-3 % | ||
| 148 | 54.5 days | Electron Capture | 100.00% |
| Alpha Decay | 9.4×10-7 % | ||
| 149 | 93.1 days | Electron Capture | 100.00% |
| 150 | 36.9 years | Electron Capture | 100.00% |
| 150m | 12.8 hours | Beta-minus Decay | 89.00% |
| Electron Capture | 11.00% | ||
| Isomeric Transition | <= 5.0×10-8 % | ||
| 151 | >= 1.7×10+18 years | Alpha Decay | No Data Available |
| 152 | 13.528 years | Beta-minus Decay | 27.90% |
| Electron Capture | 72.10% | ||
| 152m | 9.3116 hours | Beta-minus Decay | 72.00% |
| Electron Capture | 28.00% | ||
| 152m1 | 96 minutes | Isomeric Transition | 100.00% |
| 153 | STABLE | - | - |
| 154 | 8.601 years | Beta-minus Decay | 99.98% |
| Electron Capture | 0.02% | ||
| 154m | 46.3 minutes | Isomeric Transition | 100.00% |
| 155 | 4.753 years | Beta-minus Decay | 100.00% |
| 156 | 15.19 days | Beta-minus Decay | 100.00% |
| 157 | 15.18 hours | Beta-minus Decay | 100.00% |
| 158 | 45.9 minutes | Beta-minus Decay | 100.00% |
| 159 | 18.1 minutes | Beta-minus Decay | 100.00% |
| 160 | 38 seconds | Beta-minus Decay | 100.00% |
| 161 | 26 seconds | Beta-minus Decay | 100.00% |
| 162 | 10.6 seconds | Beta-minus Decay | 100.00% |
| 163 | 7.7 seconds | Beta-minus Decay | 100.00% |
| 164 | 4.2 seconds | Beta-minus Decay | 100.00% |
| 165 | 2.3 seconds | Beta-minus Decay | 100.00% |
| 166 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 167 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
This page is maintained by Steve Gagnon.