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30-Jun-2017 03:23

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Carbon dating is reliable within certain parameters but certainly not infallible.

When testing an object using radiocarbon dating, several factors have to be considered: First, carbon dating only works on matter that was once alive, and it only determines the approximate date of death for that sample.

The SUERC Radiocarbon Laboratory is involved in archaeological, forensic and environmental research, additionally using stable isotopes (13C and 15N) for dietary reconstruction.

As well as undertaking its own in-house and collaborative research, the SUERC Radiocarbon Laboratory also provides a radiocarbon dating service to national and international museums, universities and archaeology units.

Every living thing on earth contains the element carbon.

When an organism dies, be it a plant or an animal, the carbon acquired during its lifetime begins to decay at a steady, predictable rate, releasing carbon-14, a radioactive isotope with a half-life of 5,730 years.

If the spear head is dated using animal bones nearby, the accuracy of the results is entirely dependent on the assumed link between the spear head and the animal.

This is perhaps the greatest point of potential error, as assumptions about dating can lead to circular reasoning, or choosing confirming results, rather than accepting a “wrong” date.

Radiocarbon dating is a commonly used technique which relies on the fact that, although 99% of carbon atoms have six protons and six neutrons (carbon-12), about 1% have an extra neutron (carbon-13) and about one atom in a trillion has two extra neutrons (carbon-14).

Calibrated C-14 dates correspond to true calendar years; standard C-14 dates do not.

In the scientific literature, calibrated dates are usually reported as cal A.

How old are the bones found under the Greyfriars church?

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Clearly they can’t be any more recent than the Dissolution of 1538.Most archaeological items can’t be directly carbon dated, so their dating is based on testing done on nearby objects or materials.



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