Methods of dating archaeological sites

Therefore, radiocarbon dates need to be calibrated with other dating techniques to ensure accuracy.

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It is good for dating for the last 50,000 years to about 400 years ago and can create chronologies for areas that previously lacked calendars.

After an organism dies, the radiocarbon decreases through a regular pattern of decay. The time taken for half of the atoms of a radioactive isotope to decay in Carbon-14’s case is about 5730 years.

Half-lives vary according to the isotope, for example, Uranium-238 has a half-life of 4500 million years where as Nitrogen-17 has a half-life of 4.173 seconds!

The extra neutrons in Carbon-14’s case make it radioactive (thus the term, radiocarbon).

Radiocarbon is produced in the upper atmosphere after Nitrogen-14 isotopes have been impacted by cosmic radiation.

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