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Radiocarbon dating metals

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Using radiocarbon dating on metal found in Gothic cathedrals, an interdisciplinary team has shown, for the first time through absolute dating, that iron was used to reinforce stone from the construction phase. It will be published in the January issue of the Journal of Archaeological Science. This innovative method could improve understanding of medieval buildings in Europe, such as the Sainte-Chapelle, as well as in Asia, such as the temples of Angkor. Gothic architecture, which flourished from the middle of the twelfth century around Paris, included considerable amounts of iron or steel reinforcements, as shown by historical and archeological investigation. However, cathedrals are living buildings, which, over the centuries, have undergone building projects for the purposes of modification, reparation or conservation.
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Using Radiocarbon Dating to Establish the Age of Iron-Based Artifacts

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Medieval Gothic Cathedrals were built from iron and stone, researchers find - netherworldbooks.com

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How Does Radiocarbon-14 Dating Work?

Feature: Archaeotechnology. Table I. Artifact Identification. Table II.
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Despite the name, it does not give an absolute date of organic material - but an approximate age, usually within a range of a few years either way. There are three carbon isotopes that occur as part of the Earth's natural processes; these are carbon, carbon and carbon The unstable nature of carbon 14 with a precise half-life that makes it easy to measure means it is ideal as an absolute dating method. The other two isotopes in comparison are more common than carbon in the atmosphere but increase with the burning of fossil fuels making them less reliable for study 2 ; carbon also increases, but its relative rarity means its increase is negligible.
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