It's Elemental
Isotopes of the Element Samarium
Samarium
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 |
| 144 | 3.07% | STABLE |
| 147 | 14.99% | 1.060×1011 years |
| 148 | 11.24% | 7×10+15 years |
| 149 | 13.82% | STABLE |
| 150 | 7.38% | STABLE |
| 152 | 26.75% | STABLE |
| 154 | 22.75% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 128 | No Data Available | Electron Capture (suspected) | No Data Available |
| Proton Emission (suspected) | No Data Available | ||
| 129 | 0.55 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | > 0.00% | ||
| 130 | No Data Available | Electron Capture | No Data Available |
| 131 | 1.2 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | > 0.00% | ||
| 132 | 4.0 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 133 | 2.89 seconds | Electron Capture with delayed Proton Emission | > 0.00% |
| Electron Capture | 100.00% | ||
| 133m | 3.5 seconds | Electron Capture | No Data Available |
| Isomeric Transition | No Data Available | ||
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 134 | 9.5 seconds | Electron Capture | 100.00% |
| 135 | 10.3 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.02% | ||
| 136 | 47 seconds | Electron Capture | 100.00% |
| 137 | 45 seconds | Electron Capture | 100.00% |
| 138 | 3.1 minutes | Electron Capture | 100.00% |
| 139 | 2.57 minutes | Electron Capture | 100.00% |
| 139m | 10.7 seconds | Isomeric Transition | 93.70% |
| Electron Capture | 6.30% | ||
| 140 | 14.82 minutes | Electron Capture | 100.00% |
| 141 | 10.2 minutes | Electron Capture | 100.00% |
| 141m | 22.6 minutes | Electron Capture | 99.69% |
| Isomeric Transition | 0.31% | ||
| 142 | 72.49 minutes | Electron Capture | 100.00% |
| 143 | 8.75 minutes | Electron Capture | 100.00% |
| 143m | 66 seconds | Isomeric Transition | 99.76% |
| Electron Capture | 0.24% | ||
| 143m1 | 30 milliseconds | Isomeric Transition | 100.00% |
| 144 | STABLE | - | - |
| 145 | 340 days | Electron Capture | 100.00% |
| 146 | 10.3×10+7 years | Alpha Decay | 100.00% |
| 147 | 1.060×1011 years | Alpha Decay | 100.00% |
| 148 | 7×10+15 years | Alpha Decay | 100.00% |
| 149 | STABLE | - | - |
| 150 | STABLE | - | - |
| 151 | 90 years | Beta-minus Decay | 100.00% |
| 152 | STABLE | - | - |
| 153 | 46.284 hours | Beta-minus Decay | 100.00% |
| 153m | 10.6 milliseconds | Isomeric Transition | 100.00% |
| 154 | STABLE | - | - |
| 155 | 22.3 minutes | Beta-minus Decay | 100.00% |
| 156 | 9.4 hours | Beta-minus Decay | 100.00% |
| 157 | 8.03 minutes | Beta-minus Decay | 100.00% |
| 158 | 5.30 minutes | Beta-minus Decay | 100.00% |
| 159 | 11.37 seconds | Beta-minus Decay | 100.00% |
| 160 | 9.6 seconds | Beta-minus Decay | 100.00% |
| 161 | 4.8 seconds | Beta-minus Decay | 100.00% |
| 162 | 2.4 seconds | Beta-minus Decay | 100.00% |
| 163 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 164 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 165 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.