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Carbon dating archeology

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Archaeological finds worldwide have helped researchers to fill out the story of human evolution and migration. An essential piece of information in this research is the age of the fossils and artifacts. How do scientists determine their ages? Here are more details on a few of the methods used to date objects discussed in "The Great Human Migration" Smithsonian , July :. In a cave in Oregon, archaeologists found bones, plant remains and coprolites—fossilized feces.
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Radio Carbon Dating

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Carbon Dating & Archaeology | CyArk

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, a radioactive isotope with a half-life of 5, years. By measuring the amount of carbon left in the organism, scientists can estimate how long ago the organism died. Radiocarbon dates are often reported as a range. In recent years, scientists have refined methods for radiocarbon dating.
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Carbon Dating

It was while working in the Kent Laboratory building in the s that Prof. Willard Libby and his UChicago associates developed radiocarbon dating -- an innovative method to measure the age of organic materials. Scientists soon used the technique on materials ranging from the dung of a giant sloth from a Nevada cave; seaweed and algae from Monte Verde, Chile, the oldest archaeological site in the Western Hemisphere; the Shroud of Turin; and the meteorite that created the Henbury Craters in northern Australia.
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Accelerator radiocarbon dating of art, textiles, and artifacts. All rights Reserved. Accelerator mass spectrometry allows present-day scientists to look into the past by radiocarbon dating of relics such as cloth, artwork, and ancient writings. Accelerator mass spectrometry AMS is a technique for direct measurement of the concentration of radioisotopes.
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