Carbon dating range

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The clock was initially calibrated by dating objects of known age such as Egyptian mummies and bread from Pompeii; work that won Willard Libby the 1960 Nobel Prize in Chemistry.

But even he “realized that there probably would be variation”, says Christopher Bronk Ramsey, a geochronologist at the University of Oxford, UK, who led the latest work, published today in Science.

Modern accelerator mass spectrometry (used for radiocarbon dating purposes to separate radiocarbon atoms from stable carbon atoms and count them) is quite precise.

It makes no sense at all if man appeared at the end of billions of years.

In Accelerator Mass Spectrometry (AMS), for example, the number of radiocarbon atoms in a stream of atoms coming from the sample is counted.

Thus there are statistical counting uncertainties proportional to the square root of the number of atoms counted.

The precision of a radiocarbon date tells how narrow the range of dates is.

There are two main factors which determine the precision of a radiocarbon date.

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