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What carbon isotope is used in carbon dating to study the age of rock and other samples

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How do geologists use carbon dating to find the age of rocks?

This is what archaeologists use to determine the age of human-made artifacts. But carbon dating won't work on dinosaur bones. The half-life of carbon is only 5, years, so carbon dating is only effective on samples that are less than 50, years old. Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old. To determine the ages of these specimens, scientists need an isotope with a very long half-life. Some of the isotopes used for this purpose are uranium, uranium and potassium, each of which has a half-life of more than a million years. Unfortunately, these elements don't exist in dinosaur fossils themselves. Each of them typically exists in igneous rock, or rock made from cooled magma.

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Dating Methods using Radioactive Isotopes Oliver Seely Radiocarbon method The age of ancient artifacts which contain carbon can be determined by a method known as radiocarbon dating. This method is sometimes called C or carbon dating. Carbon is formed in the upper atmosphere by the bombardment of nitrogen by cosmic rays. Cosmic rays are protons, particles and some heavier ions. Other particles, including neutrons, are produced by subsequent collisions. The collision of a neutron with the nucleus of a N isotope produces C, as follows:

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How do geologists use carbon dating to find the age of rocks? July 10, Public Domain Image, source: Geologists do not use carbon-based radiometric dating to determine the age of rocks. Carbon dating only works for objects that are younger than about 50, years, and most rocks of interest are older than that.

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Carbon dating

How Does Carbon Dating Work Carbon is a weakly radioactive isotope of Carbon; also known as radiocarbon, it is an isotopic chronometer. C dating is only applicable to organic and some inorganic materials not applicable to metals. Gas proportional counting, liquid scintillation counting and accelerator mass spectrometry are the three principal radiocarbon dating methods.

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