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Posted by: Zululkis Posted on: 10.09.2020

Radiocarbon dating also referred to as carbon dating or carbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon. The method was developed in the late s at the University of Chicago by Willard Libby , who received the Nobel Prize in Chemistry for his work in It is based on the fact that radiocarbon 14 C is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting 14 C combines with atmospheric oxygen to form radioactive carbon dioxide , which is incorporated into plants by photosynthesis ; animals then acquire 14 C by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of 14 C it contains begins to decrease as the 14 C undergoes radioactive decay. Measuring the amount of 14 C in a sample from a dead plant or animal, such as a piece of wood or a fragment of bone, provides information that can be used to calculate when the animal or plant died.

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Posted by: Felkree Posted on: 10.09.2020

New study warns that rising CO 2 levels from the burning of fossil fuels will undermine the precision with which once-living things can now be scientifically dated. LONDON, 24 July, - Climate change driven by increasing levels of atmospheric carbon dioxide will not just damage the health of the planet. Forensic scientists exhuming a skeleton, Egyptologists investigating an ancient tomb, and fraud detectives concerned with suspected forgeries of Renaissance paintings could still possibly make allowances for that. Radiocarbon dating is a year-old technique now used with increasing precision to date anything once alive from the last 50, years. It exploits the natural ratio of two isotopes of carbon in the atmosphere.

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Posted by: Dodal Posted on: 10.09.2020

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