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 | 0.250% | > 2.1×10+17 years |
| 51 | 99.750% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 40 | No Data Available | Proton Emission (suspected) | No Data Available |
| 41 | No Data Available | Proton Emission (suspected) | No Data Available |
| 42 | < 55 nanoseconds | Proton Emission | No Data Available |
| 43 | 79.3 milliseconds | Electron Capture | 100.00% |
| 44 | 111 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Alpha Decay | No Data Available | ||
| 44m | 150 milliseconds | Electron Capture | 100.00% |
| 45 | 547 milliseconds | Electron Capture | 100.00% |
| 46 | 422.50 milliseconds | Electron Capture | 100.00% |
| 46m | 1.02 milliseconds | Isomeric Transition | 100.00% |
| 47 | 32.6 minutes | Electron Capture | 100.00% |
| 48 | 15.9735 days | Electron Capture | 100.00% |
| 49 | 330 days | Electron Capture | 100.00% |
| 50 | > 2.1×10+17 years | Electron Capture | > 92.90% |
| Beta-minus Decay | < 7.10% | ||
| 51 | STABLE | - | - |
| 52 | 3.743 minutes | Beta-minus Decay | 100.00% |
| 53 | 1.543 minutes | Beta-minus Decay | 100.00% |
| 54 | 49.8 seconds | Beta-minus Decay | 100.00% |
| 55 | 6.54 seconds | Beta-minus Decay | 100.00% |
| 56 | 0.216 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 57 | 0.32 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 58 | 191 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 59 | 97 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | < 3.00% | ||
| 60 | 68 milliseconds | Beta-minus Decay | No Data Available |
| 60m | 40 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| Beta-minus Decay | 100.00% | ||
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 61 | 52.6 milliseconds | Beta-minus Decay with delayed Neutron Emission | >= 6.00% |
| Beta-minus Decay | 100.00% | ||
| 62 | 33.5 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 63 | 19.2 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | ~ 35.00% | ||
| 64 | 19 milliseconds | Beta-minus Decay | 100.00% |
| 65 | > 360 nanoseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 66 | > 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.