Radiocarbon dating
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Radiocarbon dating is a method for estimating the age of material by measuring the amount of radiocarbon in it. This technique is based on assumptions about the concentration of carbon-14 in the atmosphere, and measured half-life of carbon-14 as approximately 5568 ± 30 years.
When the age of the material is a few thousand years old, the assumptions become more important and the estimates are less reliable. Sometimes due to atmospheric disturbances the level of carbon-14 varies. For example, testing of nuclear weapons in the atmosphere nearly doubled the concentration of carbon-14 in the Northern Hemisphere.