It's Elemental
Isotopes of the Element Lanthanum
Lanthanum
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 |
| 138 | 0.08881% | 1.02×10+11 years |
| 139 | 99.9119% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 117 | 23.5 milliseconds | Proton Emission | 93.90% |
| Electron Capture | 6.10% | ||
| 117m | 10 milliseconds | Proton Emission | 97.40% |
| Electron Capture | 2.60% | ||
| 118 | No Data Available | Electron Capture (suspected) | No Data Available |
| 119 | No Data Available | Electron Capture (suspected) | No Data Available |
| 120 | 2.8 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | > 0.00% | ||
| 121 | 5.3 seconds | Electron Capture | 100.00% |
| 122 | 8.6 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 123 | 17 seconds | Electron Capture | 100.00% |
| 124 | 29.21 seconds | Electron Capture | 100.00% |
| 124m | 21 seconds | Electron Capture | 100.00% |
| 125 | 64.8 seconds | Electron Capture | 100.00% |
| 125m | 0.39 seconds | No Data Available | No Data Available |
| 126 | 54 seconds | Electron Capture | > 0.00% |
| 126m | < 50 seconds | Electron Capture | No Data Available |
| Isomeric Transition | No Data Available | ||
| 127 | 5.1 minutes | Electron Capture | 100.00% |
| 127m | 3.7 minutes | Electron Capture | 100.00% |
| Isomeric Transition | No Data Available | ||
| 128 | 5.18 minutes | Electron Capture | 100.00% |
| 128m | < 1.4 minutes | Electron Capture | 100.00% |
| 129 | 11.6 minutes | Electron Capture | 100.00% |
| 129m | 0.56 seconds | Isomeric Transition | 100.00% |
| 130 | 8.7 minutes | Electron Capture | 100.00% |
| 131 | 59 minutes | Electron Capture | 100.00% |
| 132 | 4.8 hours | Electron Capture | 100.00% |
| 132m | 24.3 minutes | Isomeric Transition | 76.00% |
| Electron Capture | 24.00% | ||
| 133 | 3.912 hours | Electron Capture | 100.00% |
| 134 | 6.45 minutes | Electron Capture | 100.00% |
| 135 | 19.5 hours | Electron Capture | 100.00% |
| 136 | 9.87 minutes | Electron Capture | 100.00% |
| 136m | 114 milliseconds | Isomeric Transition | 100.00% |
| 137 | 6×10+4 years | Electron Capture | 100.00% |
| 138 | 1.02×10+11 years | Electron Capture | 65.60% |
| Beta-minus Decay | 34.40% | ||
| 139 | STABLE | - | - |
| 140 | 1.67855 days | Beta-minus Decay | 100.00% |
| 141 | 3.92 hours | Beta-minus Decay | 100.00% |
| 142 | 91.1 minutes | Beta-minus Decay | 100.00% |
| 143 | 14.2 minutes | Beta-minus Decay | 100.00% |
| 144 | 40.8 seconds | Beta-minus Decay | 100.00% |
| 145 | 24.8 seconds | Beta-minus Decay | 100.00% |
| 146 | 6.27 seconds | Beta-minus Decay | 100.00% |
| 146m | 10.0 seconds | Beta-minus Decay | 100.00% |
| 147 | 4.06 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.04% | ||
| 148 | 1.26 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.15% | ||
| 149 | 1.05 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 1.43% | ||
| 150 | 0.86 seconds | Beta-minus Decay with delayed Neutron Emission | 2.70% |
| Beta-minus Decay | 100.00% | ||
| 151 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 152 | > 150 nanoseconds | Beta-minus Decay | 100.00% |
| 153 | > 100 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 154 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 155 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
Citation and linking information
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