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The small pieces of bone were combusted to produce carbon dioxide which was then put through a mass spectrometer.Testing two pieces each at two different facilities should provide consistent results – and indeed it did. The proportion of C-14 in the atmosphere, and hence in living things, is not constant but varies over the centuries, and it also varies between the atmosphere and the oceans.These atoms rapidly decay into radiocarbon-dioxide and along with ordinary CO2 are absorbed by living plants.As plants enter the human and animal food chains the C14 dioxide enters their living tissue.In contrast, however, the oceans and the life that they support represent a rather heterogeneous reservoir that is not in equilibrium with the atmosphere.

Then, the collagen fraction is isolated and purified using filters.The SUERC results showed a 95% probability that the bone samples dated from around AD1430-1460, and over in Oxford the results both came out at around AD1412-1449, again with a 95% confidence. Radiocarbon dating of marine organisms can be out by up to several hundred years, and this effect can occur to a lesser degree in terrestrial life where sea-food forms part of the diet.The mass spectrometry of the Greyfriars bone samples reveals that the individual in question had a high-protein diet including a significant proportion of seafood.In addition, another burial found nearby was also dated to determine whether it was the same age as the Archer, or whether it represented a later phase of burial activity at the site.The first stage in the process of radiocarbon dating using AMS (Accelerator Mass Spectrometry) is to drill a small sample of bone powder from the bone itself.

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