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Calcium

Isotopes of the Element Potassium

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

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 nanosecondsBeta-minus Decay with delayed
Double Neutron Emission (suspected)
No Data Available