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This process frees electrons within minerals that remain caught within the item.
Heating an item to 500 degrees Celsius or higher releases the trapped electrons, producing light.
The date measured reveals the last time that the object was heated past the closure temperature at which the trapped argon can escape the lattice.
K–Ar dating was used to calibrate the geomagnetic polarity time scale.
Cosmic radiation entering the earth’s atmosphere produces carbon-14, and plants take in carbon-14 as they fix carbon dioxide.
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Potassium-40 is a radioactive isotope of potassium that decays into argon-40.