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 |
| 112 | 0.97% | < 1.3×10+21 years |
| 114 | 0.66% | STABLE |
| 115 | 0.34% | STABLE |
| 116 | 14.54% | STABLE |
| 117 | 7.68% | STABLE |
| 118 | 24.22% | STABLE |
| 119 | 8.59% | STABLE |
| 120 | 32.58% | STABLE |
| 122 | 4.63% | STABLE |
| 124 | 5.79% | > 1.2×10+21 years |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 99 | No Data Available | Electron Capture (suspected) | No Data Available |
| Electron Capture with delayed Proton Emission (suspected) | No Data Available | ||
| 100 | 0.86 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | < 17.00% | ||
| 101 | 1.7 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 26.00% | ||
| 102 | 3.8 seconds | Electron Capture | 100.00% |
| 103 | 7.0 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 1.20% | ||
| 104 | 20.8 seconds | Electron Capture | 100.00% |
| 105 | 32.7 seconds | Electron Capture with delayed Proton Emission | 0.01% |
| Electron Capture | 100.00% | ||
| 106 | 115 seconds | Electron Capture | 100.00% |
| 107 | 2.90 minutes | Electron Capture | 100.00% |
| 108 | 10.30 minutes | Electron Capture | 100.00% |
| 109 | 18.0 minutes | Electron Capture | 100.00% |
| 110 | 4.11 hours | Electron Capture | 100.00% |
| 111 | 35.3 minutes | Electron Capture | 100.00% |
| 112 | < 1.3×10+21 years | Double Electron Capture | No Data Available |
| 113 | 115.09 days | Electron Capture | 100.00% |
| 113m | 21.4 minutes | Electron Capture | 8.90% |
| Isomeric Transition | 91.10% | ||
| 114 | STABLE | - | - |
| 115 | STABLE | - | - |
| 116 | STABLE | - | - |
| 117 | STABLE | - | - |
| 117m | 13.76 days | Isomeric Transition | 100.00% |
| 118 | STABLE | - | - |
| 119 | STABLE | - | - |
| 119m | 293.1 days | Isomeric Transition | 100.00% |
| 120 | STABLE | - | - |
| 121 | 27.03 hours | Beta-minus Decay | 100.00% |
| 121m | 43.9 years | Isomeric Transition | 77.60% |
| Beta-minus Decay | 22.40% | ||
| 122 | STABLE | - | - |
| 123 | 129.2 days | Beta-minus Decay | 100.00% |
| 123m | 40.06 minutes | Beta-minus Decay | 100.00% |
| 124 | > 1.2×10+21 years | Double Beta-minus Decay | No Data Available |
| 125 | 9.64 days | Beta-minus Decay | 100.00% |
| 125m | 9.52 minutes | Beta-minus Decay | 100.00% |
| 126 | 2.30×10+5 years | Beta-minus Decay | 100.00% |
| 127 | 2.10 hours | Beta-minus Decay | 100.00% |
| 127m | 4.13 minutes | Beta-minus Decay | 100.00% |
| 128 | 59.07 minutes | Beta-minus Decay | 100.00% |
| 128m | 6.5 seconds | Isomeric Transition | 100.00% |
| 129 | 2.23 minutes | Beta-minus Decay | 100.00% |
| 129m | 6.9 minutes | Beta-minus Decay | 100.00% |
| Isomeric Transition | < 2.0×10-3 % | ||
| 130 | 3.72 minutes | Beta-minus Decay | 100.00% |
| 130m | 1.7 minutes | Beta-minus Decay | 100.00% |
| 131 | 56.0 seconds | Beta-minus Decay | 100.00% |
| 131m | 58.4 seconds | Beta-minus Decay | 100.00% |
| Isomeric Transition | No Data Available | ||
| 132 | 39.7 seconds | Beta-minus Decay | 100.00% |
| 133 | 1.46 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.03% | ||
| 134 | 1.050 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 17.00% | ||
| 135 | 530 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 21.00% | ||
| 136 | 0.25 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 30.00% | ||
| 137 | 190 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 58.00% | ||
| 138 | > 408 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.