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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.

Accurate tree ring records of age are available for a period extending 9,000 years into the past.

But that's not really how it is when scientists are working in their labs.

To understand how the C-14 clock works and what processes are involved, let us consider the egg-timer.

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.