It's Elemental
Isotopes of the Element Thulium
Thulium
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 |
| 169 | 100% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 144 | 1.9 microseconds | Proton Emission | > 0.00% |
| 145 | 3.17 microseconds | Proton Emission | 100.00% |
| 146 | 80 milliseconds | Electron Capture | No Data Available |
| Proton Emission | No Data Available | ||
| 146m | 200 milliseconds | Proton Emission | No Data Available |
| Electron Capture | No Data Available | ||
| 147 | 0.58 seconds | Electron Capture | 85.00% |
| Proton Emission | 15.00% | ||
| 147m | 0.36 milliseconds | Proton Emission | 100.00% |
| 148 | 0.7 seconds | Electron Capture | 100.00% |
| 149 | 0.9 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.20% | ||
| 150 | 2.20 seconds | Electron Capture | 100.00% |
| 150m | 5.2 milliseconds | Isomeric Transition | 100.00% |
| 151 | 4.17 seconds | Electron Capture | 100.00% |
| 151m | 6.6 seconds | Electron Capture | 100.00% |
| 152 | 8.0 seconds | Electron Capture | 100.00% |
| 152m | 5.2 seconds | Electron Capture | 100.00% |
| 153 | 1.48 seconds | Alpha Decay | 91.00% |
| Electron Capture | 9.00% | ||
| 153m | 2.5 seconds | Alpha Decay | 92.00% |
| Electron Capture | 8.00% | ||
| 154 | 8.1 seconds | Alpha Decay | 54.00% |
| Electron Capture | 46.00% | ||
| 154m | 3.30 seconds | Electron Capture | 42.00% |
| Isomeric Transition | No Data Available | ||
| Alpha Decay | 58.00% | ||
| 155 | 21.6 seconds | Electron Capture | 99.11% |
| Alpha Decay | 0.89% | ||
| 155m | 45 seconds | Electron Capture | > 98.00% |
| Alpha Decay | < 2.00% | ||
| 156 | 83.8 seconds | Electron Capture | 99.94% |
| Alpha Decay | 0.06% | ||
| 157 | 3.63 minutes | Electron Capture | 100.00% |
| 158 | 3.98 minutes | Electron Capture | 100.00% |
| 158m | 20 seconds | Electron Capture (suspected) | No Data Available |
| 159 | 9.13 minutes | Electron Capture | 100.00% |
| 160 | 9.4 minutes | Electron Capture | 100.00% |
| 160m | 74.5 seconds | Isomeric Transition | 85.00% |
| Electron Capture | 15.00% | ||
| 161 | 30.2 minutes | Electron Capture | 100.00% |
| 162 | 21.70 minutes | Electron Capture | 100.00% |
| 162m | 24.3 seconds | Isomeric Transition | 81.00% |
| Electron Capture | 19.00% | ||
| 163 | 1.810 hours | Electron Capture | 100.00% |
| 164 | 2.0 minutes | Electron Capture | 100.00% |
| 164m | 5.1 minutes | Isomeric Transition | ~ 80.00% |
| Electron Capture | ~ 20.00% | ||
| 165 | 30.06 hours | Electron Capture | 100.00% |
| 166 | 7.70 hours | Electron Capture | 100.00% |
| 166m | 340 milliseconds | Isomeric Transition | 100.00% |
| 167 | 9.25 days | Electron Capture | 100.00% |
| 168 | 93.1 days | Electron Capture | 99.99% |
| Beta-minus Decay | 0.01% | ||
| 169 | STABLE | - | - |
| 170 | 128.6 days | Beta-minus Decay | 99.87% |
| Electron Capture | 0.13% | ||
| 171 | 1.92 years | Beta-minus Decay | 100.00% |
| 172 | 63.6 hours | Beta-minus Decay | 100.00% |
| 173 | 8.24 hours | Beta-minus Decay | 100.00% |
| 174 | 5.4 minutes | Beta-minus Decay | 100.00% |
| 174m | 2.29 seconds | Isomeric Transition | 99.00% |
| Beta-minus Decay | < 1.00% | ||
| 175 | 15.2 minutes | Beta-minus Decay | 100.00% |
| 176 | 1.9 minutes | Beta-minus Decay | 100.00% |
| 177 | 90 seconds | Beta-minus Decay | 100.00% |
| 178 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| 179 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
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