It's Elemental
Isotopes of the Element Cerium
Cerium
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 |
| 136 | 0.185% | > 0.7×10+14 years |
| 138 | 0.251% | >= 0.9×10+14 years |
| 140 | 88.450% | STABLE |
| 142 | 11.114% | > 5×10+16 years |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 119 | No Data Available | Electron Capture (suspected) | No Data Available |
| 120 | No Data Available | Electron Capture (suspected) | No Data Available |
| 121 | 1.1 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | ~ 1.00% | ||
| 122 | No Data Available | Electron Capture | No Data Available |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 123 | 3.8 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | > 0.00% | ||
| 124 | 6 seconds | Electron Capture | 100.00% |
| 125 | 9.7 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | No Data Available | ||
| 126 | 51.0 seconds | Electron Capture | 100.00% |
| 127 | 34 seconds | Electron Capture | 100.00% |
| 127m | 28.6 seconds | Electron Capture | 100.00% |
| 128 | 3.93 minutes | Electron Capture | 100.00% |
| 129 | 3.5 minutes | Electron Capture | > 0.00% |
| 130 | 22.9 minutes | Electron Capture | 100.00% |
| 131 | 10.3 minutes | Electron Capture | 100.00% |
| 131m | 5.4 minutes | Electron Capture | 100.00% |
| Isomeric Transition | No Data Available | ||
| 132 | 3.51 hours | Electron Capture | 100.00% |
| 132m | 9.4 milliseconds | Isomeric Transition | 100.00% |
| 133 | 97 minutes | Electron Capture | 100.00% |
| 133m | 5.1 hours | Electron Capture | No Data Available |
| Isomeric Transition | No Data Available | ||
| 134 | 3.16 days | Electron Capture | 100.00% |
| 135 | 17.7 hours | Electron Capture | 100.00% |
| 135m | 20 seconds | Isomeric Transition | 100.00% |
| 136 | > 0.7×10+14 years | Double Electron Capture | No Data Available |
| 137 | 9.0 hours | Electron Capture | 100.00% |
| 137m | 34.4 hours | Isomeric Transition | 99.21% |
| Electron Capture | 0.79% | ||
| 138 | >= 0.9×10+14 years | Double Electron Capture | 100.00% |
| 138m | 8.65 milliseconds | Isomeric Transition | 100.00% |
| 139 | 137.641 days | Electron Capture | 100.00% |
| 139m | 54.8 seconds | Isomeric Transition | 100.00% |
| 140 | STABLE | - | - |
| 141 | 32.508 days | Beta-minus Decay | 100.00% |
| 142 | > 5×10+16 years | Double Beta-minus Decay | No Data Available |
| 143 | 33.039 hours | Beta-minus Decay | 100.00% |
| 144 | 284.91 days | Beta-minus Decay | 100.00% |
| 145 | 3.01 minutes | Beta-minus Decay | 100.00% |
| 146 | 13.52 minutes | Beta-minus Decay | 100.00% |
| 147 | 56.4 seconds | Beta-minus Decay | 100.00% |
| 148 | 56 seconds | Beta-minus Decay | 100.00% |
| 149 | 5.3 seconds | Beta-minus Decay | 100.00% |
| 150 | 4.0 seconds | Beta-minus Decay | 100.00% |
| 151 | 1.76 seconds | Beta-minus Decay | 100.00% |
| 151m | 1.02 seconds | Beta-minus Decay | No Data Available |
| 152 | 1.4 seconds | Beta-minus Decay | 100.00% |
| 153 | > 100 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 154 | > 100 nanoseconds | Beta-minus Decay | 100.00% |
| 155 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 156 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 157 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.