Potassium 40 radioactive dating
Potassium is a common element found in many materials, such as micas, clay minerals, tephra, and evaporites.
These factors introduce error limits on the upper and lower bounds of dating, so that final determination of age is reliant on the environmental factors during formation, melting, and exposure to decreased pressure and/or open-air.
He was employed at Caltech's Division of Geological & Planetary Sciences at the time of writing the first edition.
He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.
It is used in the manufacture of soft soaps and as an electrolyte in alkaline batteries.
Potassium chloride is used as a healthier alternative to table salt.