Chemical dating techniques

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Thus dating that particular tree does not necessarily indicate when the fire burned or the structure was built.

For this reason, many archaeologists prefer to use samples from short-lived plants for radiocarbon dating.

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.

One of the most widely used is potassium–argon dating (K–Ar dating).

Potassium-40 is a radioactive isotope of potassium that decays into argon-40.

It cannot be used to accurately date a site on its own.

However, it can be used to confirm the antiquity of an item.

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