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How Does Radiocarbon Dating Work? - Instant Egghead #28
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This method worked, but it was slow and costly. Chemists and geologists use tritium dating to determine the age of water ocean and fresh. After 5, years, the amount of carbon 14 left in the body is half of the original amount. In the absence of any historical data concerning the intensity of cosmic radiation, Libby simply assumed that it had been constant. These natural sources of radiation account for the largest amount of radiation received by most people. Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon. The circular arrangement of Geiger counters center detected radiation in samples while the thick metal shields on all sides were designed to reduce background radiation. We can use a formula for carbon 14 dating to find the answer. Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.
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