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But if they are earlier than 1485, then they can’t be Richard’s remains.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).Renfrew (1973) called it 'the radiocarbon revolution' in describing its impact upon the human sciences.Oakley (1979) suggested its development meant an almost complete re-writing of the evolution and cultural emergence of the human species.Since radiocarbon is incorporated into all living things, this pulse is an isotopic chronometer of the past half-century.

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Herbivores lag the atmosphere slightly because their primary carbon source is on the order of months old.

The isotopic content of new plant growth reflects the atmospheric radiocarbon concentration.

New leaves are produced in weeks while larger fruit and vegetables form over the period of a month or two.

How old are the bones found under the Greyfriars church?

Clearly they can’t be any more recent than the Dissolution of 1538.

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