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 |
| 55 | 100% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 44 | < 105 nanoseconds | Electron Capture | No Data Available |
| Proton Emission | No Data Available | ||
| 45 | No Data Available | No Data Available | No Data Available |
| 46 | 36.2 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 57.00% | ||
| 47 | 88.0 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | < 1.70% | ||
| 48 | 158.1 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.28% | ||
| Electron Capture with delayed Alpha Decay | < 6.0×10-4 % | ||
| 49 | 382 milliseconds | Electron Capture | 100.00% |
| 50 | 283.19 milliseconds | Electron Capture | 100.00% |
| 50m | 1.75 minutes | Electron Capture | 100.00% |
| 51 | 46.2 minutes | Electron Capture | 100.00% |
| 52 | 5.591 days | Electron Capture | 100.00% |
| 52m | 21.1 minutes | Electron Capture | 98.25% |
| Isomeric Transition | 1.75% | ||
| 53 | 3.74×10+6 years | Electron Capture | 100.00% |
| 54 | 312.12 days | Electron Capture | 100.00% |
| Beta-minus Decay | < 2.9×10-4 % | ||
| 55 | STABLE | - | - |
| 56 | 2.5789 hours | Beta-minus Decay | 100.00% |
| 57 | 85.4 seconds | Beta-minus Decay | 100.00% |
| 58 | 3.0 seconds | Beta-minus Decay | 100.00% |
| 58m | 65.4 seconds | Beta-minus Decay | ~ 90.00% |
| Isomeric Transition | ~ 10.00% | ||
| 59 | 4.59 seconds | Beta-minus Decay | 100.00% |
| 60 | 0.28 seconds | Beta-minus Decay | 100.00% |
| 60m | 1.77 seconds | Beta-minus Decay | 88.50% |
| Isomeric Transition | 11.50% | ||
| 61 | 0.67 seconds | Beta-minus Decay | 100.00% |
| 62 | 671 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 62m | 92 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 63 | 0.275 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 64 | 90 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 33.00% | ||
| 64m | 0.50 milliseconds | Isomeric Transition | 100.00% |
| 65 | 84 milliseconds | Beta-minus Decay | 100.00% |
| 66 | 65 milliseconds | Beta-minus Decay | 100.00% |
| 67 | 51 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | > 10.0% | ||
| 68 | 28 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 69 | 18 milliseconds | Beta-minus Decay | 100.00% |
| 70 | > 360 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 71 | > 637 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.