It's Elemental - 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.

Isotopes of the Element Potassium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

39	93.2581%	Stable

40	0.0117%	1.265×10⁺⁹ years

41	6.7302%	Stable

All Known Isotopes of the Element Potassium

Mass Number	Half-life	Decay Mode	Branching Percentage

32	No Data Available	Proton Emission	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	3.4E-3

37	1.226 seconds	Electron Capture	100.00

38	7.636 minutes	Electron Capture	100.00

38_m	923.9 milliseconds	Electron Capture	100.00

39	Stable	-	-

40	1.265×10⁺⁹ years	Beta-minus Decay	89.28

		Electron Capture	10.72

41	Stable	-	-

42	12.360 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	17.3 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	100.00

		Beta-minus Decay with delayed Neutron Emission	1.14

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	105 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	~ 64.00

		Beta-minus Decay	No Data Available

53	30 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	~ 67.00

		Beta-minus Decay with delayed Double Neutron Emission	~ 17.00

54	10 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	> 0.00