It's Elemental
Isotopes of the Element Antimony
Antimony
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 |
| 121 | 57.21% | STABLE |
| 123 | 42.79% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 103 | 1.5 microseconds | Electron Capture (suspected) | No Data Available |
| 104 | 0.44 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | < 7.00% | ||
| Proton Emission | < 1.00% | ||
| 105 | 1.22 seconds | Electron Capture | 99.00% |
| Proton Emission | 1.00% | ||
| 106 | 0.6 seconds | Electron Capture | No Data Available |
| 107 | 4.0 seconds | Electron Capture | 100.00% |
| 108 | 7.4 seconds | Electron Capture | 100.00% |
| 109 | 17.0 seconds | Electron Capture | 100.00% |
| 110 | 23.0 seconds | Electron Capture | 100.00% |
| 111 | 75 seconds | Electron Capture | 100.00% |
| 112 | 51.4 seconds | Electron Capture | 100.00% |
| 113 | 6.67 minutes | Electron Capture | 100.00% |
| 114 | 3.49 minutes | Electron Capture | 100.00% |
| 115 | 32.1 minutes | Electron Capture | 100.00% |
| 116 | 15.8 minutes | Electron Capture | 100.00% |
| 116m | 60.3 minutes | Electron Capture | 100.00% |
| 117 | 2.80 hours | Electron Capture | 100.00% |
| 118 | 3.6 minutes | Electron Capture | 100.00% |
| 118m | 5.00 hours | Electron Capture | 100.00% |
| 119 | 38.19 hours | Electron Capture | 100.00% |
| 119m | 0.85 seconds | Isomeric Transition | 100.00% |
| 120 | 15.89 minutes | Electron Capture | 100.00% |
| 120m | 5.76 days | Electron Capture | 100.00% |
| 121 | STABLE | - | - |
| 122 | 2.7238 days | Beta-minus Decay | 97.59% |
| Electron Capture | 2.41% | ||
| 122m | 4.191 minutes | Isomeric Transition | 100.00% |
| 123 | STABLE | - | - |
| 124 | 60.20 days | Beta-minus Decay | 100.00% |
| 124m | 93 seconds | Isomeric Transition | 75.00% |
| Beta-minus Decay | 25.00% | ||
| 124m1 | 20.2 minutes | Isomeric Transition | 100.00% |
| 125 | 2.75856 years | Beta-minus Decay | 100.00% |
| 126 | 12.35 days | Beta-minus Decay | 100.00% |
| 126m | 19.15 minutes | Beta-minus Decay | 86.00% |
| Isomeric Transition | 14.00% | ||
| 126m1 | ≈ 11 seconds | Isomeric Transition | 100.00% |
| 127 | 3.85 days | Beta-minus Decay | 100.00% |
| 128 | 9.01 hours | Beta-minus Decay | 100.00% |
| 128m | 10.4 minutes | Beta-minus Decay | 96.40% |
| Isomeric Transition | 3.60% | ||
| 129 | 4.40 hours | Beta-minus Decay | 100.00% |
| 129m | 17.7 minutes | Beta-minus Decay | 85.00% |
| Isomeric Transition | 15.00% | ||
| 130 | 39.5 minutes | Beta-minus Decay | 100.00% |
| 130m | 6.3 minutes | Beta-minus Decay | 100.00% |
| 131 | 23.03 minutes | Beta-minus Decay | 100.00% |
| 132 | 2.79 minutes | Beta-minus Decay | 100.00% |
| 132m | 4.10 minutes | Beta-minus Decay | 100.00% |
| 133 | 2.34 minutes | Beta-minus Decay | 100.00% |
| 134 | 0.78 seconds | Beta-minus Decay | 100.00% |
| 134m | 10.07 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.09% | ||
| 135 | 1.679 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 22.00% | ||
| 136 | 0.923 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 16.30% | ||
| 137 | 492 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 49.00% | ||
| 138 | 350 milliseconds | Beta-minus Decay with delayed Neutron Emission | 72.00% |
| Beta-minus Decay | 100.00% | ||
| 139 | 93 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 90.00% | ||
| 140 | > 407 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| Beta-minus Decay with delayed Double Neutron Emission | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.