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 |
| 50 | 4.345% | > 1.3×10+18 years |
| 52 | 83.789% | STABLE |
| 53 | 9.501% | STABLE |
| 54 | 2.365% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 42 | 13.3 milliseconds | Electron Capture with delayed Proton Emission | 94.40% |
| Electron Capture | 100.00% | ||
| 43 | 20.6 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 81.00% | ||
| Electron Capture with delayed Double Proton Emission | 7.10% | ||
| Electron Capture with delayed Triple Proton Emission | 0.08% | ||
| 44 | 42.8 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 14.00% | ||
| 45 | 60.9 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 34.40% | ||
| 46 | 0.26 seconds | Electron Capture | 100.00% |
| 47 | 500 milliseconds | Electron Capture | 100.00% |
| 48 | 21.56 hours | Electron Capture | 100.00% |
| 49 | 42.3 minutes | Electron Capture | 100.00% |
| 50 | > 1.3×10+18 years | Double Electron Capture | No Data Available |
| 51 | 27.7025 days | Electron Capture | 100.00% |
| 52 | STABLE | - | - |
| 53 | STABLE | - | - |
| 54 | STABLE | - | - |
| 55 | 3.497 minutes | Beta-minus Decay | 100.00% |
| 56 | 5.94 minutes | Beta-minus Decay | 100.00% |
| 57 | 21.1 seconds | Beta-minus Decay | 100.00% |
| 58 | 7.0 seconds | Beta-minus Decay | 100.00% |
| 59 | 1.05 seconds | Beta-minus Decay | 100.00% |
| 60 | 0.49 seconds | Beta-minus Decay | 100.00% |
| 61 | 243 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 62 | 206 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 63 | 129 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 64 | 42 milliseconds | Beta-minus Decay | 100.00% |
| 65 | 28 milliseconds | Beta-minus Decay | 100.00% |
| 66 | 23 milliseconds | Beta-minus Decay | 100.00% |
| 67 | No Data Available | Beta-minus Decay (suspected) | No Data Available |
| 68 | > 360 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available |
This page is maintained by Steve Gagnon.