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Dating ancient remains

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Over the past six decades, the amount of radiocarbon in people or their remains depends heavily on when they were born or, more precisely, when their tissues were formed.

Forensic anthropologists at The University of Arizona took advantage of this fact in a recent study funded by NIJ.

Around 99% of carbon on earth is carbon-12 – atoms with six protons and six neutrons in its nucleus.

The new method is based on the fact that over the past 60 years, environmental levels of radiocarbon have been significantly perturbed by mid-20th-century episodes of above-ground nuclear weapons testing.

Before the nuclear age, the amount of radiocarbon in the environment varied little in the span of a century.

But once it dies, no more fresh radiocarbon is absorbed, and what’s left starts to decay.

Once samples are older than around 40,000 years, though, amounts of radiocarbon remaining are very small and difficult to measure.