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Why is it important to know about carbon dating

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How Do Scientists Date Ancient Things?

This carbon — 14 cycles through an organism while it is alive, but once it dies, the organism accumulates no additional carbon — Fortunately, Libby was a smart guy and accounted for this discrepancy. All organic material has decaying Carbon in it. These atoms have one or two more neutrons in the nucleus than most Carbon atoms. Carbon has a relatively short half-life of 5, years, meaning that the fraction of carbon in a sample is halved over the course of 5, years due to radioactive decay to nitrogen Some of these radiocarbon atoms find their way into living trees and other plants in the form of carbon dioxide , as a result of photosynthesis. Radiocarbon dating is a method that provides objective age estimates for carbon-based materials that originated from living organisms. There are also trace amounts of the unstable radioisotope carbon 14 C on Earth. In order to know how long a sample of radioactive material had been decomposing we need three variables defined, how much of the sample we have left now, what the half-life of the sample is, and how much of the sample we started out with. Though still heavily used, relative dating is now augmented by several modern dating techniques.

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However, Libby then assumed that the amount of Carbon in the atmosphere was relatively constant for a very long time up until the Industrial revolution. Using the same techniques to measure 14 C content, we can examine ocean circulation and trace the movement of drugs around the body. Carbon is constantly be generated in the atmosphere and cycled through the carbon and nitrogen cycles.

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A recent proof of that would be the Industrial revolution. Figure 1: Carbon dioxide is used in photosynthesis by plants, and from here is passed through the food chain. Carbon dating is used now for almost everything old that people want to date.

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Carbon-14 dating

Radiocarbon dating is essentially a method designed to measure residual radioactivity. Unfortunately, neither are straightforward to determine. The reaction must have started when the Earth was formed, and thus the reaction would reach equilibrium after the Earth was 30, years old. However, many objects were found in caves, frozen in ice , or in other areas whose ages were not known; in these cases, it was clear that a method for dating the actual object was necessary.

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