One such indicator is the uranium-thorium dating method used by the Lamont-Doherty group.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.
The Lamont-Doherty scientists conducted their analyses on samples of coral drilled from a reef off the island of Barbados.
Because it is radioactive, carbon 14 steadily decays into other substances.
But when a plant or animal dies, it can no longer accumulate fresh carbon 14, and the supply in the organism at the time of death is gradually depleted.
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Since 1947, scientists have reckoned the ages of many old objects by measuring the amounts of radioactive carbon they contain.
Many scientists will use carbon dating test results to back up their position if the results agree with their preconceived theories.
But if the carbon dating results actually conflict with their ideas, they aren't too concerned. Thorpe, Nikos Kokkinos, Robert Morkot and John Frankish), Preface to Centuries of Darkness, 1991) So, is carbon dating accurate?
Therefore they have sought ways to calibrate and correct the carbon dating method.