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Carbon 14 decay dating method

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The Manot Cave, a natural limestone formation, had been sealed for some 15,000 years. — Gihon Spring was crucial to the survival of its inhabitants, and archaeologists had uncovered the remains of a massive stone tower built to guard this vital water supply. — In a new paper, the authors explain how harvesting data from tree-rings could revolutionize the study of ancient civilizations such as the Egyptian and Mayan worlds. — Researchers have used radiocarbon measured in deep-sea fossil corals to shed light on carbon dioxide levels during Earth's last deglaciation.

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So, if you measure the amount of C14 in a dead organism, you can figure out how long ago it stopped exchanging carbon with its atmosphere.Back in the 1940s, the American chemist Willard Libby used this fact to determine the ages of organisms long dead.Most carbon atoms have six protons and six neutrons in their nuclei and are called carbon 12. But a tiny percentage of carbon is made of carbon 14, or radiocarbon, which has six protons and eight neutrons and is not stable: half of any sample of it decays into other atoms after 5,700 years.The ratio of radiocarbon to stable carbon atoms in the atmosphere has varied in the past.This is because the amount and strength of cosmic radiation entering the earth's atmosphere has varied over time.It is commonly assumed that being large contributes to vulnerability during extinction crises. One popular theory about the Paleolithic cave paintings proposes that sites were chosen based on the acoustics in the caves.