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In about 89.28% of events it decays to calcium-40 ( Potassium-40 is especially important in potassium–argon (K–Ar) dating.
Argon is a gas that does not ordinarily combine with other elements.
It makes up 0.012% (120 ppm) of the total amount of potassium found in nature.
It has been noted that xenoliths in certain Hawaiian volcanics contain fluid inclusions which show evidence of formation at depth.
Thus, the amount of calcium originally present is not known and can vary enough to confound measurements of the small increases produced by radioactive decay.
The ratio of the amount of which was present at the beginning of the elapsed time period.
It has been proposed that significant core radioactivity (1–2 TW) may be caused by high levels of U, Th, and K.
Potassium–argon dating, abbreviated K–Ar dating, is a radiometric dating method used in geochronology and archaeology.