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 |
| 54 | 5.845% | STABLE |
| 56 | 91.754% | STABLE |
| 57 | 2.119% | STABLE |
| 58 | 0.282% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 45 | 1.89 milliseconds | Double Proton Emission | 70.00% |
| Electron Capture | <= 30.00% | ||
| Electron Capture with delayed Proton Emission | 19.00% | ||
| Electron Capture with delayed Double Proton Emission | 7.80% | ||
| Electron Capture with delayed Triple Proton Emission | 3.30% | ||
| 46 | 13.0 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 78.70% | ||
| 47 | 21.9 milliseconds | Electron Capture with delayed Proton Emission | 88.4% |
| Electron Capture with delayed Double Proton Emission | No Data Available | ||
| Electron Capture | 100.00% | ||
| 48 | 45.3 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 15.90% | ||
| 49 | 64.7 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 56.70% | ||
| 50 | 155 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission (suspected) | No Data Available | ||
| 51 | 305 milliseconds | Electron Capture | 100.00% |
| 52 | 8.275 hours | Electron Capture | 100.00% |
| 52m | 45.9 seconds | Isomeric Transition | < 4.0×10-3 % |
| Electron Capture | 100.00% | ||
| 53 | 8.51 minutes | Electron Capture | 100.00% |
| 53m | 2.54 minutes | Isomeric Transition | 100.00% |
| 54 | STABLE | - | - |
| 55 | 2.744 years | Electron Capture | 100.00% |
| 56 | STABLE | - | - |
| 57 | STABLE | - | - |
| 58 | STABLE | - | - |
| 59 | 44.495 days | Beta-minus Decay | 100.00% |
| 60 | 2.62×10+6 years | Beta-minus Decay | 100.00% |
| 61 | 5.98 minutes | Beta-minus Decay | 100.00% |
| 62 | 68 seconds | Beta-minus Decay | 100.00% |
| 63 | 6.1 seconds | Beta-minus Decay | 100.00% |
| 64 | 2.0 seconds | Beta-minus Decay | 100.00% |
| 65 | 0.81 seconds | Beta-minus Decay | 100.00% |
| 65m | 1.12 seconds | Beta-minus Decay | 100.00% |
| 66 | 440 milliseconds | Beta-minus Decay | 100.00% |
| 67 | 0.40 seconds | Beta-minus Decay | 100.00% |
| 68 | 180 milliseconds | Beta-minus Decay | 100.00% |
| 69 | 110 milliseconds | Beta-minus Decay | 100.00% |
| 70 | 71 milliseconds | Beta-minus Decay | 100.00% |
| 71 | 28 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 72 | >= 150 nanoseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 27.60% | ||
| 73 | > 633 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 | ||
| 74 | > 638 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 |
This page is maintained by Steve Gagnon.