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Isotopes of the Element Potassium

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
3993.2581%STABLE
400.0117%1.248×10+9 years
416.7302%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
32No Data AvailableProton Emission (suspected)No Data Available
33< 25 nanosecondsProton EmissionNo Data Available
34< 25 nanosecondsProton EmissionNo Data Available
35178 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.37%
36342 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.05%
Electron Capture with
delayed Alpha Decay
3.4×10-3 %
371.226 secondsElectron Capture100.00%
387.636 minutesElectron Capture100.00%
38m924.3 millisecondsElectron Capture99.97%
Isomeric Transition0.03%
39STABLE--
401.248×10+9 yearsBeta-minus Decay89.28%
Electron Capture10.72%
41STABLE--
4212.321 hoursBeta-minus Decay100.00%
4322.3 hoursBeta-minus Decay100.00%
4422.13 minutesBeta-minus Decay100.00%
4517.81 minutesBeta-minus Decay100.00%
46105 secondsBeta-minus Decay100.00%
4717.50 secondsBeta-minus Decay100.00%
486.8 secondsBeta-minus Decay with
delayed Neutron Emission
1.14%
Beta-minus Decay100.00%
491.26 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
86.00%
50472 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
29.00%
51365 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
47.00%
52118 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
~ 73.00%
5330 millisecondsBeta-minus Decay with
delayed Neutron Emission
~ 75.00%
Beta-minus Decay with delayed
Double Neutron Emission
< 10%
Beta-minus Decay100.00%
5410 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
> 0.00%
55> 360 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
56> 620 nanosecondsBeta-minus DecayNo Data Available
56m620 nanosecondsBeta-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