Other methods of carbon dating

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Carbon dating , or carbon dating, is a method for comparing the ages of organic materials such as bones or artifacts made from anything that once lived. Unlike many other radiometric dating methods, carbon dating has been calibrated for historical periods and within that range can give reliable results. The technique is based on comparing the levels of 14 C and 12 C isotopes in the sample. In the meantime, however, the 14 C will combine with oxygen in the atmosphere to form carbon dioxide , which enters the food chain via photosynthesis in plants. This ratio is about one 14 C atom for every 1,,,, 12 C atoms. However, when the sample dies, it stops ingesting 14 C, so as the 14 C decays to 14 N, the ratio of 14 C and 12 C changes.
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Willard Libby and Radiocarbon Dating

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How Carbon Dating Works | HowStuffWorks

Radiometric dating involves dating rocks or other objects by measuring the extent to which different radioactive isotopes or nuclei have decayed. Although the time at which any individual atom will decay cannot be forecast, the time in which any given percentage of a sample will decay can be calculated to varying degrees of accuracy. The time that it takes for half of a sample to decay is known as the half life of the isotope. Some isotopes have half lives longer than the present age of the universe , but they are still subject to the same laws of quantum physics and will eventually decay, even if doing so at a time when all remaining atoms in the universe are separated by astronomical distances. Various elements are used for dating different time periods; ones with relatively short half-lives like carbon or 14 C are useful for dating once-living objects since they include atmospheric carbon from when they were alive from about ten to fifty thousand years old. See Carbon dating. Longer-lived isotopes provide dating information for much older times.
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What are alternatives to carbon dating?

By: Marshall Brain. A child mummy is found high in the Andes and the archaeologist says the child lived more than 2, years ago. How do scientists know how old an object or human remains are? What methods do they use and how do these methods work? In this article, we will examine the methods by which scientists use radioactivity to determine the age of objects, most notably carbon dating.
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