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C measurements on 11 iron pieces, ranging in carbon content from medium carbon (0.22%) wrought iron (1.2 kg used) to high carbon (3.2%) cast iron (30 g), thereby demonstrating the feasibility of the technique for (1982) repeated two of van der Merwe's measurements, and carried out two analyses on a recently rediscovered Elizabethan(? Thirty grams were required of this medium carbon wrought iron to obtain an age using small proportional counters.

Because the ratio of C-12 to C-14 in the atmosphere fluctuates, the date given by the radiocarbon process may not correspond to an actual calendar date.

Accusing politicians of failing to support the technology, which helps to reduce the levels of carbon dioxide emissions, in a report the committee said the UK could miss out on its chance to become a world leader in the nascent sector.

It comes after the government cancelled two funding initiatives to support the construction of the UK's first large-scale and commercial carbon capture and storage (CCS) project, despite having already spent £168m on the project.

To make the dates more accurate, they are calibrated to the fluctuations.

A rapid advance in the development of human cultures, which happened around 50,000 years ago.

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