It's Elemental
Isotopes of the Element Potassium
Potassium
Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.
Isotopes With A Known Natural Abundance
| Mass Number | Natural Abundance | Half-life |
| 39 | 93.2581% | STABLE |
| 40 | 0.0117% | 1.248×10+9 years |
| 41 | 6.7302% | STABLE |
Known Isotopes
| Mass Number | Half-life | Decay Mode | Branching Percentage |
| 32 | No Data Available | Proton Emission (suspected) | No Data Available |
| 33 | < 25 nanoseconds | Proton Emission | No Data Available |
| 34 | < 25 nanoseconds | Proton Emission | No Data Available |
| 35 | 178 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.37% | ||
| 36 | 342 milliseconds | Electron Capture | 100.00% |
| Electron Capture with delayed Proton Emission | 0.05% | ||
| Electron Capture with delayed Alpha Decay | 3.4×10-3 % | ||
| 37 | 1.226 seconds | Electron Capture | 100.00% |
| 38 | 7.636 minutes | Electron Capture | 100.00% |
| 38m | 924.3 milliseconds | Electron Capture | 99.97% |
| Isomeric Transition | 0.03% | ||
| 39 | STABLE | - | - |
| 40 | 1.248×10+9 years | Beta-minus Decay | 89.28% |
| Electron Capture | 10.72% | ||
| 41 | STABLE | - | - |
| 42 | 12.321 hours | Beta-minus Decay | 100.00% |
| 43 | 22.3 hours | Beta-minus Decay | 100.00% |
| 44 | 22.13 minutes | Beta-minus Decay | 100.00% |
| 45 | 17.81 minutes | Beta-minus Decay | 100.00% |
| 46 | 105 seconds | Beta-minus Decay | 100.00% |
| 47 | 17.50 seconds | Beta-minus Decay | 100.00% |
| 48 | 6.8 seconds | Beta-minus Decay with delayed Neutron Emission | 1.14% |
| Beta-minus Decay | 100.00% | ||
| 49 | 1.26 seconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 86.00% | ||
| 50 | 472 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 29.00% | ||
| 51 | 365 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | 47.00% | ||
| 52 | 118 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | ~ 73.00% | ||
| 53 | 30 milliseconds | Beta-minus Decay with delayed Neutron Emission | ~ 75.00% |
| Beta-minus Decay with delayed Double Neutron Emission | < 10% | ||
| Beta-minus Decay | 100.00% | ||
| 54 | 10 milliseconds | Beta-minus Decay | 100.00% |
| Beta-minus Decay with delayed Neutron Emission | > 0.00% | ||
| 55 | > 360 nanoseconds | Beta-minus Decay | No Data Available |
| Beta-minus Decay with delayed Neutron Emission | No Data Available | ||
| 56 | > 620 nanoseconds | Beta-minus Decay | No Data Available |
| 56m | 620 nanoseconds | Beta-minus Decay with delayed Neutron Emission (suspected) | No Data Available |
| 56m1 | > 620 nanoseconds | Beta-minus Decay with delayed Double Neutron Emission (suspected) | No Data Available |
Citation and linking information
For questions about this page, please contact Carol McKisson.