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 |
| 63 | 69.15% | STABLE |
| 65 | 30.85% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 52 | No Data Available | Proton Emission | No Data Available |
| 53 | < 300 nanoseconds | Electron Capture | No Data Available |
| Proton Emission | No Data Available | ||
| 54 | < 75 nanoseconds | Proton Emission | No Data Available |
| 55 | 27 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 15.0% | ||
| 56 | 93 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.40% | ||
| 57 | 196.3 milliseconds | Electron Capture | 100.00% |
| 58 | 3.204 seconds | Electron Capture | 100.00% |
| 59 | 81.5 seconds | Electron Capture | 100.00% |
| 60 | 23.7 minutes | Electron Capture | 100.00% |
| 61 | 3.333 hours | Electron Capture | 100.00% |
| 62 | 9.673 minutes | Electron Capture | 100.00% |
| 63 | STABLE | - | - |
| 64 | 12.701 hours | Electron Capture | 61.50% |
| Beta-minus Decay | 38.50% | ||
| 65 | STABLE | - | - |
| 66 | 5.120 minutes | Beta-minus Decay | 100.00% |
| 67 | 61.83 hours | Beta-minus Decay | 100.00% |
| 68 | 30.9 seconds | Beta-minus Decay | 100.00% |
| 68m | 3.75 minutes | Isomeric Transition | 84.00% |
| Beta-minus Decay | 16.00% | ||
| 69 | 2.85 minutes | Beta-minus Decay | 100.00% |
| 70 | 44.5 seconds | Beta-minus Decay | 100.00% |
| 70m | 33 seconds | Beta-minus Decay | 52.00% |
| Isomeric Transition | 48.00% | ||
| 70m1 | 6.6 seconds | Beta-minus Decay | 93.20% |
| Isomeric Transition | 6.80% | ||
| 71 | 19.4 seconds | Beta-minus Decay | 100.00% |
| 72 | 6.63 seconds | Beta-minus Decay | 100.00% |
| 73 | 4.2 seconds | Beta-minus Decay | 100.00% |
| 74 | 1.594 seconds | Beta-minus Decay | 100.00% |
| 75 | 1.222 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 3.50% | ||
| 76 | 637 milliseconds | Beta-minus Decay with delayed Neutron Emission | 7.20% |
| Beta-minus Decay | 100.00% | ||
| 76m | 1.27 seconds | Beta-minus Decay | 100.00% |
| 77 | 468.1 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 30.30% | ||
| 78 | 335 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | > 65.00% | ||
| 79 | 188 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 55.00% | ||
| 80 | 0.17 seconds | Beta-minus Decay | No Data Available |
| 81 | > 632 nanoseconds | Beta-minus Decay with delayed Neutron Emission | No Data Available |
| Beta-minus Decay | No Data Available | ||
| Beta-minus Decay with delayed Double Neutron Emission | No Data Available | ||
| 82 | > 636 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.