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Carbon dating biology

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Radiocarbon Dating - American Chemical Society

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18.5D: Carbon Dating and Estimating Fossil Age

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.
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When researchers find a bone or artifact, how do they know how old it is? While there are a number of answers to that question, most of which depend largely on the age and surroundings of the item, carbon dating is surely one of the most important. The physics, chemistry, and biology, behind carbon dating is absolutely fascinating and worth knowing.
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