Can carbon dating false

Uranium 234, a radioactive element present in the environment, slowly decays to form thorium 230.

Using a mass spectrometer, an instrument that accelerates streams of atoms and uses magnets to sort them out according to mass and electric charge, the group has learned to measure the ratio of uranium to thorium very precisely.

One such indicator is the uranium-thorium dating method used by the Lamont-Doherty group.Dating Subject to Error But scientists have long recognized that carbon dating is subject to error because of a variety of factors, including contamination by outside sources of carbon.Therefore they have sought ways to calibrate and correct the carbon dating method.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.

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