Science Education
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 |
| 174 | 0.16% | 2.0×10+15 years |
| 176 | 5.26% | STABLE |
| 177 | 18.60% | STABLE |
| 178 | 27.28% | STABLE |
| 179 | 13.62% | STABLE |
| 180 | 35.08% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 153 | 60 nanoseconds | Electron Capture (suspected) | No Data Available |
| 154 | 2 seconds | Electron Capture | 100.00% |
| Alpha Decay (suspected) | No Data Available | ||
| 155 | 0.84 seconds | Electron Capture | 100.00% |
| 156 | 23 milliseconds | Alpha Decay | 100.00% |
| 156m | 0.52 milliseconds | Alpha Decay | 100.00% |
| 157 | 110 milliseconds | Alpha Decay | 86.00% |
| Electron Capture | 14.00% | ||
| 158 | 2.85 seconds | Alpha Decay | 44.30% |
| Electron Capture | 55.70% | ||
| 159 | 5.6 seconds | Electron Capture | 65.00% |
| Alpha Decay | 35.00% | ||
| 160 | 13.6 seconds | Electron Capture | 99.30% |
| Alpha Decay | 0.70% | ||
| 161 | 18.2 seconds | Electron Capture | > 99.87% |
| Alpha Decay | < 0.13% | ||
| 162 | 39.4 seconds | Electron Capture | 99.99% |
| Alpha Decay | 8.0×10-3 % | ||
| 163 | 40.0 seconds | Electron Capture | 100.00% |
| Alpha Decay | < 1.0×10-4 % | ||
| 164 | 111 seconds | Electron Capture | 100.00% |
| 165 | 76 seconds | Electron Capture | 100.00% |
| 166 | 6.77 minutes | Electron Capture | 100.00% |
| 167 | 2.05 minutes | Electron Capture | 100.00% |
| 168 | 25.95 minutes | Electron Capture | 100.00% |
| 169 | 3.24 minutes | Electron Capture | 100.00% |
| 170 | 16.01 hours | Electron Capture | 100.00% |
| 171 | 12.1 hours | Electron Capture | 100.00% |
| 171m | 29.5 seconds | Isomeric Transition | <= 100.00% |
| Electron Capture | No Data Available | ||
| 172 | 1.87 years | Electron Capture | 100.00% |
| 173 | 23.6 hours | Electron Capture | 100.00% |
| 174 | 2.0×10+15 years | Alpha Decay | 100.00% |
| 175 | 70 days | Electron Capture | 100.00% |
| 176 | STABLE | - | - |
| 177 | STABLE | - | - |
| 177m | 1.09 seconds | Isomeric Transition | 100.00% |
| 177m1 | 51.4 minutes | Isomeric Transition | 100.00% |
| 178 | STABLE | - | - |
| 178m | 4.0 seconds | Isomeric Transition | 100.00% |
| 178m1 | 31 years | Isomeric Transition | 100.00% |
| 179 | STABLE | - | - |
| 179m | 18.67 seconds | Isomeric Transition | 100.00% |
| 179m1 | 25.05 days | Isomeric Transition | 100.00% |
| 180 | STABLE | - | - |
| 180m | 5.47 hours | Isomeric Transition | 99.70% |
| Beta-minus Decay | 0.30% | ||
| 181 | 42.39 days | Beta-minus Decay | 100.00% |
| 181m | 1.5 milliseconds | Isomeric Transition | 100.00% |
| 182 | 8.90×10+6 years | Beta-minus Decay | 100.00% |
| 182m | 61.5 minutes | Beta-minus Decay | 54.00% |
| Isomeric Transition | 46.00% | ||
| 183 | 1.018 hours | Beta-minus Decay | 100.00% |
| 184 | 4.12 hours | Beta-minus Decay | 100.00% |
| 184m | 48 seconds | Isomeric Transition | 100.00% |
| 185 | 3.5 minutes | Beta-minus Decay | 100.00% |
| 186 | 2.6 minutes | Beta-minus Decay | 100.00% |
| 187 | 0.27 microseconds | Beta-minus Decay | 100.00% |
| 188 | No Data Available | Beta-minus Decay | No Data Available |
| 189 | No Data Available | No Data Available | No Data Available |
This page is maintained by Steve Gagnon.
