It's Elemental
Isotopes of the Element Iodine
Iodine
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 |
| 127 | 100% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 107 | No Data Available | No Data Available | No Data Available |
| 108 | 36 milliseconds | Alpha Decay | 91.00% |
| Electron Capture | 9.00% | ||
| Proton Emission | < 1.00% | ||
| 109 | 93.5 microseconds | Proton Emission | 99.99% |
| Alpha Decay | 0.01% | ||
| 110 | 0.65 seconds | Electron Capture | 83.00% |
| Alpha Decay | 17.00% | ||
| Electron Capture with delayed Proton Emission | 11.00% | ||
| Electron Capture with delayed Alpha Decay | 1.10% | ||
| 111 | 2.5 seconds | Electron Capture | 99.90% |
| Alpha Decay | ~ 0.10% | ||
| 112 | 3.42 seconds | Electron Capture | 100.00% |
| Alpha Decay | ~ 1.2×10-3 % | ||
| 113 | 6.6 seconds | Electron Capture | 100.00% |
| Alpha Decay | 3.3×10-7 % | ||
| 114 | 2.1 seconds | Electron Capture with delayed Proton Emission | No Data Available |
| Electron Capture | 100.00% | ||
| 114m | 6.2 seconds | Electron Capture | 91.00% |
| Isomeric Transition | 9.00% | ||
| 115 | 1.3 minutes | Electron Capture | 100.00% |
| 116 | 2.91 seconds | Electron Capture | 100.00% |
| 117 | 2.22 minutes | Electron Capture | 100.00% |
| 118 | 13.7 minutes | Electron Capture | 100.00% |
| 118m | 8.5 minutes | Electron Capture | < 100.00% |
| Isomeric Transition | No Data Available | ||
| 119 | 19.1 minutes | Electron Capture | 100.00% |
| 120 | 81.6 minutes | Electron Capture | 100.00% |
| 120m | 53 minutes | Electron Capture | 100.00% |
| 121 | 2.12 hours | Electron Capture | 100.00% |
| 122 | 3.63 minutes | Electron Capture | 100.00% |
| 123 | 13.2235 hours | Electron Capture | 100.00% |
| 124 | 4.1760 days | Electron Capture | 100.00% |
| 125 | 59.407 days | Electron Capture | 100.00% |
| 126 | 12.93 days | Electron Capture | 52.70% |
| Beta-minus Decay | 47.30% | ||
| 127 | STABLE | - | - |
| 128 | 24.99 minutes | Beta-minus Decay | 93.10% |
| Electron Capture | 6.90% | ||
| 129 | 1.57×10+7 years | Beta-minus Decay | 100.00% |
| 130 | 12.36 hours | Beta-minus Decay | 100.00% |
| 130m | 8.84 minutes | Beta-minus Decay | 16.00% |
| Isomeric Transition | 84.00% | ||
| 131 | 8.0252 days | Beta-minus Decay | 100.00% |
| 132 | 2.295 hours | Beta-minus Decay | 100.00% |
| 132m | 1.387 hours | Isomeric Transition | 86.00% |
| Beta-minus Decay | 14.00% | ||
| 133 | 20.83 hours | Beta-minus Decay | 100.00% |
| 133m | 9 seconds | Isomeric Transition | 100.00% |
| 134 | 52.5 minutes | Beta-minus Decay | 100.00% |
| 134m | 3.52 minutes | Isomeric Transition | 97.70% |
| Beta-minus Decay | 2.30% | ||
| 135 | 6.58 hours | Beta-minus Decay | 100.00% |
| 136 | 83.4 seconds | Beta-minus Decay | 100.00% |
| 136m | 46.9 seconds | Beta-minus Decay | 100.00% |
| 137 | 24.5 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 7.14% | ||
| 138 | 6.23 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 5.56% | ||
| 139 | 2.280 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 10.00% | ||
| 140 | 0.86 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 9.30% | ||
| 141 | 0.43 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 21.20% | ||
| 142 | 222 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available | ||
| 143 | 130 milliseconds | Beta-minus Decay (suspected) | No Data Available |
| 144 | > 300 nanoseconds | Beta-minus Decay (suspected) | No Data Available |
| 145 | > 407 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.