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 |
| 103 | 100% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 89 | 1.5 microseconds | Electron Capture (suspected) | No Data Available |
| Proton Emission (suspected) | No Data Available | ||
| 90 | 12 milliseconds | Electron Capture (suspected) | No Data Available |
| 90m | 1.0 seconds | Electron Capture (suspected) | No Data Available |
| 91 | 1.47 seconds | Electron Capture | No Data Available |
| 91m | 1.46 seconds | Electron Capture | No Data Available |
| 92 | 4.66 seconds | Electron Capture | 100.00% |
| 92m | 0.53 seconds | Electron Capture | 100.00% |
| 93 | 12.2 seconds | Electron Capture | 100.00% |
| 94 | 66 seconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 1.80% | ||
| 94m | 25.8 seconds | Electron Capture | 100.00% |
| 95 | 5.02 minutes | Electron Capture | 100.00% |
| 95m | 1.96 minutes | Isomeric Transition | 88.00% |
| Electron Capture | 12.00% | ||
| 96 | 9.90 minutes | Electron Capture | 100.00% |
| 96m | 1.51 minutes | Isomeric Transition | 60.00% |
| Electron Capture | 40.00% | ||
| 97 | 30.7 minutes | Electron Capture | 100.00% |
| 97m | 46.2 minutes | Electron Capture | 94.40% |
| Isomeric Transition | 5.60% | ||
| 98 | 8.72 minutes | Electron Capture | 100.00% |
| 98m | 3.6 minutes | Electron Capture | 11.00% |
| Isomeric Transition | 89.00% | ||
| 99 | 16.1 days | Electron Capture | 100.00% |
| 99m | 4.7 hours | Electron Capture | > 99.84% |
| Isomeric Transition | < 0.16% | ||
| 100 | 20.8 hours | Electron Capture | 100.00% |
| 100m | 4.6 minutes | Isomeric Transition | ~ 98.30% |
| Electron Capture | ~ 1.70% | ||
| 101 | 3.3 years | Electron Capture | 100.00% |
| 101m | 4.34 days | Electron Capture | 92.80% |
| Isomeric Transition | 7.20% | ||
| 102 | 207.3 days | Beta-minus Decay | 22.00% |
| Electron Capture | 78.00% | ||
| 102m | 3.742 years | Electron Capture | 99.77% |
| Isomeric Transition | 0.23% | ||
| 103 | STABLE | - | - |
| 103m | 56.114 minutes | Isomeric Transition | 100.00% |
| 104 | 42.3 seconds | Beta-minus Decay | 99.55% |
| Electron Capture | 0.45% | ||
| 104m | 4.34 minutes | Isomeric Transition | 99.87% |
| Beta-minus Decay | 0.13% | ||
| 105 | 35.36 hours | Beta-minus Decay | 100.00% |
| 105m | 42.9 seconds | Isomeric Transition | 100.00% |
| 106 | 30.07 seconds | Beta-minus Decay | 100.00% |
| 106m | 131 minutes | Beta-minus Decay | 100.00% |
| 107 | 21.7 minutes | Beta-minus Decay | 100.00% |
| 108 | 16.8 seconds | Beta-minus Decay | 100.00% |
| 108m | 6.0 minutes | Beta-minus Decay | 100.00% |
| Isomeric Transition | No Data Available | ||
| 109 | 80 seconds | Beta-minus Decay | 100.00% |
| 110 | 28.5 seconds | Beta-minus Decay | 100.00% |
| 110m | 3.2 seconds | Beta-minus Decay | 100.00% |
| 111 | 11 seconds | Beta-minus Decay | 100.00% |
| 112 | 3.45 seconds | Beta-minus Decay | 100.00% |
| 112m | 6.73 seconds | Beta-minus Decay | 100.00% |
| 113 | 2.80 seconds | Beta-minus Decay | 100.00% |
| 114 | 1.85 seconds | Beta-minus Decay | 100.00% |
| 114m | 1.86 seconds | Beta-minus Decay | 100.00% |
| 115 | 0.99 seconds | Beta-minus Decay | 100.00% |
| 116 | 0.68 seconds | Beta-minus Decay | 100.00% |
| 116m | 0.57 seconds | Beta-minus Decay | 100.00% |
| 117 | 0.44 seconds | Beta-minus Decay | 100.00% |
| 118 | 266 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 3.10% | ||
| 119 | 171 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 6.40% | ||
| 120 | 136 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | < 5.40% | ||
| 121 | 151 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 122 | > 300 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 123 | > 403 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 124 | > 391 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 | ||
| 125 | > 393 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 126 | > 395 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Double Neutron Emission | No Data Available | ||
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.