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Atomic: M.A.C. | Reference
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Isotopes of Potassium
Notable Isotopes
39K [20 neutrons]
Abundance: 93.26%
Stable with 20 neutrons
40K [21 neutrons]
Abundance: 0.012%
Half life: 1.277 x 109 years [ beta- ]
Decay Energy: 1.311MeV
Decays to 40Ca.
Half life: 1.277 x 109 years [ Electron Capture ]
Decay Energy: 1.505MeV
Decays to 40Ar.
Half life: 1.277 x 109 years [ beta+ ]
Decay Energy: 1.505MeV
Decays to 40Ar.
In healthy animals and people, 40K represents the largest source of radioactivity, greater even then 14C. In a human body of 70 kg mass, about 170,000 nuclei of 40K decay per second.
41K [22 neutrons]
Abundance: 6.73%
Stable with 22 neutrons