Carbon dating of objects

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"Libby's method remained the only way to measure carbon-14 in samples for several decades and was long considered the most accurate means of dating by carbon decay," said David Mazziotti, a UChicago chemistry professor who submitted the formal nomination of the site as a historic chemical landmark to the American Chemical Society.

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Scientists can determine how long ago an organism died by measuring how much carbon-14 is left relative to the carbon-12."This radiocarbon dating method was a transformative advance to archaeology and historical studies, allowing the determination of the age of archeological sites and objects without reliance on a knowledge of local customs and history," said Viresh Rawal, professor and chair of the Department of Chemistry.Transformative research The designation of UChicago as a National Historic Chemical Landmark joins the University's 2006 designation by the American Physical Society as an historic physics site to commemorate the work of Robert Millikan, who received the 1923 Nobel Prize in physics for experiments conducted at the Ryerson Physical Laboratory building, 1100 E. A plaque commemorating that work hangs in the first-floor lobby of the Kersten Physics Teaching Center, 5720 S. Two scientists working at the University of California Radiation Laboratory in Berkeley discovered carbon-14 in 1940.The society will officially recognize the achievement at 4 p.m. 10, with the unveiling of a plaque in the foyer of the Kent Chemical Laboratory building at 1020 E. This year marks the 70th anniversary of Libby's first publication on radiocarbon dating, which appeared in the June 1, 1946 issue of .The work earned Libby the 1960 Nobel Prize in chemistry "for determinations in archaeology, geology, geophysics and other branches of science." The technique, which measures materials' content of carbon-14, quickly made an impact on archaeology and geology.

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