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The most important archaeological dating method is radiocarbon dating.It is a technique that can yield absolute dates with accuracy up to approximately 5000 years before present.
This is only because it is well calibrated with objects of known age.
Radiocarbon or C14 dating employs complex systems of measuring the unstable isotopes in once living matter.
There are three forms of carbon that naturally occur forming the building blocks of all plant and animal life.
The stable C12 and C13, and the unstable or radioactive Carbon 14. Only one C14 atom exists for every one trillion C12 atoms.
Nitrogen atoms in the upper atmosphere are struck by cosmic radiation and create C14 atoms.
Libby, the discoverer of the C14 dating method, was very disappointed with this problem.