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 |
| 113 | 4.29% | STABLE |
| 115 | 95.71% | 4.41×10+14 years |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 97 | No Data Available | Electron Capture (suspected) | No Data Available |
| Proton Emission (suspected) | No Data Available | ||
| 98 | 32 milliseconds | Electron Capture | No Data Available |
| 98m | 1.2 seconds | Electron Capture | No Data Available |
| 99 | 3.0 seconds | Electron Capture | No Data Available |
| 100 | 5.9 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 1.60% | ||
| 101 | 15.1 seconds | Electron Capture with delayed Proton Emission | No Data Available |
| Electron Capture | No Data Available | ||
| 102 | 23.3 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 9.3×10-3 % | ||
| 103 | 65 seconds | Electron Capture | 100.00% |
| 103m | 34 seconds | Electron Capture | 67.00% |
| Isomeric Transition | 33.00% | ||
| 104 | 1.80 minutes | Electron Capture | 100.00% |
| 104m | 15.7 seconds | Isomeric Transition | 80.00% |
| Electron Capture | 20.00% | ||
| 105 | 5.07 minutes | Electron Capture | 100.00% |
| 105m | 48 seconds | Isomeric Transition | 100.00% |
| 106 | 6.2 minutes | Electron Capture | 100.00% |
| 106m | 5.2 minutes | Electron Capture | 100.00% |
| 107 | 32.4 minutes | Electron Capture | 100.00% |
| 107m | 50.4 seconds | Isomeric Transition | 100.00% |
| 108 | 58.0 minutes | Electron Capture | 100.00% |
| 108m | 39.6 minutes | Electron Capture | 100.00% |
| 109 | 4.167 hours | Electron Capture | 100.00% |
| 109m | 1.34 minutes | Isomeric Transition | 100.00% |
| 109m1 | 0.209 seconds | Isomeric Transition | 100.00% |
| 110 | 4.9 hours | Electron Capture | 100.00% |
| 110m | 69.1 minutes | Electron Capture | 100.00% |
| 111 | 2.8047 days | Electron Capture | 100.00% |
| 111m | 7.7 minutes | Isomeric Transition | 100.00% |
| 112 | 14.97 minutes | Electron Capture | 56.00% |
| Beta-minus Decay | 44.00% | ||
| 112m | 20.56 minutes | Isomeric Transition | 100.00% |
| 113 | STABLE | - | - |
| 113m | 99.476 minutes | Isomeric Transition | 100.00% |
| 114 | 71.9 seconds | Beta-minus Decay | 99.50% |
| Electron Capture | 0.50% | ||
| 114m | 49.51 days | Electron Capture | 3.25% |
| Isomeric Transition | 96.75% | ||
| 115 | 4.41×10+14 years | Beta-minus Decay | 100.00% |
| 115m | 4.486 hours | Isomeric Transition | 95.00% |
| Beta-minus Decay | 5.00% | ||
| 116 | 14.10 seconds | Beta-minus Decay | 99.98% |
| Electron Capture | 0.02% | ||
| 116m | 54.29 minutes | Beta-minus Decay | 100.00% |
| 116m1 | 2.18 seconds | Isomeric Transition | 100.00% |
| 117 | 43.2 minutes | Beta-minus Decay | 100.00% |
| 117m | 116.2 minutes | Beta-minus Decay | 52.90% |
| Isomeric Transition | 47.10% | ||
| 118 | 5.0 seconds | Beta-minus Decay | 100.00% |
| 118m | 4.45 minutes | Beta-minus Decay | 100.00% |
| 118m1 | 8.5 seconds | Isomeric Transition | 98.60% |
| Beta-minus Decay | 1.40% | ||
| 119 | 2.4 minutes | Beta-minus Decay | 100.00% |
| 119m | 18.0 minutes | Beta-minus Decay | 95.60% |
| Isomeric Transition | 4.40% | ||
| 120 | 3.08 seconds | Beta-minus Decay | 100.00% |
| 120m | 47.3 seconds | Beta-minus Decay | 100.00% |
| 120m1 | 46.2 seconds | Beta-minus Decay | 100.00% |
| 121 | 23.1 seconds | Beta-minus Decay | 100.00% |
| 121m | 3.88 minutes | Beta-minus Decay | 98.80% |
| Isomeric Transition | 1.20% | ||
| 122 | 1.5 seconds | Beta-minus Decay | 100.00% |
| 122m | 10.3 seconds | Beta-minus Decay | 100.00% |
| 122m1 | 10.8 seconds | Beta-minus Decay | 100.00% |
| 123 | 6.17 seconds | Beta-minus Decay | 100.00% |
| 123m | 47.4 seconds | Beta-minus Decay | 100.00% |
| 124 | 3.12 seconds | Beta-minus Decay | 100.00% |
| 124m | 3.7 seconds | Beta-minus Decay | 100.00% |
| 125 | 2.36 seconds | Beta-minus Decay | 100.00% |
| 125m | 12.2 seconds | Beta-minus Decay | 100.00% |
| 126 | 1.53 seconds | Beta-minus Decay | 100.00% |
| 126m | 1.64 seconds | Beta-minus Decay | 100.00% |
| 127 | 1.09 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | <= 0.03% | ||
| 127m | 3.67 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.69% | ||
| 127m1 | 1.04 seconds | Beta-minus Decay | 100.00% |
| 128 | 0.84 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | < 0.05% | ||
| 128m | 0.72 seconds | Beta-minus Decay with delayed Neutron Emission | < 0.05% |
| Beta-minus Decay | 100.00% | ||
| 129 | 0.61 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.25% | ||
| 129m | 1.23 seconds | Beta-minus Decay | > 99.70% |
| Beta-minus Decay with delayed Neutron Emission | 2.50% | ||
| Isomeric Transition | < 0.30% | ||
| 129m1 | 0.67 seconds | Beta-minus Decay | 100.00% |
| 130 | 0.29 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 0.93% | ||
| 130m | 0.54 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 1.65% | ||
| Beta-minus Decay | 100.00% | ||
| Beta-minus Decay with delayed Neutron Emission | 1.65% | ||
| 131 | 0.28 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | <= 2.00% | ||
| 131m | 0.35 seconds | Beta-minus Decay | >= 99.98% |
| Beta-minus Decay with delayed Neutron Emission | <= 2.00% | ||
| Isomeric Transition | <= 0.02% | ||
| 131m1 | 0.32 seconds | Beta-minus Decay | > 99.00% |
| Isomeric Transition | < 1.00% | ||
| Beta-minus Decay with delayed Neutron Emission | ~ 0.03% | ||
| 132 | 0.207 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 6.30% | ||
| 133 | 165 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 85.00% | ||
| 133m | 180 milliseconds | Beta-minus Decay | No Data Available |
| Isomeric Transition | No Data Available | ||
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 134 | 140 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 65.00% | ||
| 135 | 92 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.