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    Has radiometric dating ever been wrong

    Various geologic, atmospheric and solar processes can influence atmospheric carbon-14 levels.

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

    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.

    Carbon dating is used to work out the age of organic material — in effect, any living thing.

    Radiocarbon is not suitable for this purpose because it is only applicable: a) on a time scale of thousands of years and b) to remains of once-living organisms (with minor exceptions, from which rocks are excluded).

    It is too soon to know whether the discovery will seriously upset the estimated dates of events like the arrival of human beings in the Western Hemisphere, scientists said.

    But it is already clear that the carbon method of dating will have to be recalibrated and corrected in some cases.

    Scientists at the Lamont-Doherty Geological Laboratory of Columbia University at Palisades, N.

    Y., reported today in the British journal Nature that some estimates of age based on carbon analyses were wrong by as much as 3,500 years.

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