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Climate records from a Japanese lake are set to improve the accuracy of the dating technique, which could help to shed light on archaeological mysteries such as why Neanderthals became extinct.

Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.

It was found that the C/N ratios of raw bone samples are inversely proportional to the carbon content and residue amount after gelatinization. Well-preserved bone samples are found to be physically dense.

We have examined a few dozen Korean archaeological bone samples for this study. The range of C/N ratios of Korean raw bone samples ranged from 3.4 to 74.

The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.

Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive.

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