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One standard deviation has a 68% probability and two standard deviations have a 95% probability.Radiocarbon dating has had an enormous impact on archaeology around the world since it made it possible to date carbon and wood could be directly without dependence on characteristic artifacts or written historical records.When this method was first developed, a fairly large amount of carbon was necessary for dating but use of the AMS (accelerator mass spectrometer) today necessitates only a few milligrams for analysis.

This is particularly true of marine samples and contemporary shells may seem to be hundreds of years old. These radioactive isotopes are unstable, decaying over time at a predictable rate.As the isotopes decay, they give off particles from their nucleus and become a different isotope.These samples are carefully cataloged and analyzed with a mass spectrometer.The mass spectrometer is able to give information about the type and amount of isotopes found in the rock.

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