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It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old.Carbon has two stable, nonradioactive isotopes: carbon-12 (12C) and carbon-13 (13C).These isotopes are stable, which is why they are with us today, but unstable isotopes are also present in minute amounts.About one carbon atom in a trillion (10) contains a radioactive nucleus with 6 protons and 8 neutrons — carbon 14.Finding the age of an object using radiometric dating is a four step process.As long as you follow these four steps you will always be able to accurately determine the age of a rock or fossil.This lesson can be done in two, 45-minute class periods.Radiocarbon dating (usually referred to simply as carbon-14 dating) is a radiometric dating method.

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The exercise they will go through of predicting and successively counting the number of remaining "mark-side up" candies should help them understand that rates of decay of unstable nuclei can be measured; that the exact time that a certain nucleus will decay cannot be predicted; and that it takes a very large number of nuclei to find the rate of decay.For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.



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