Carbon dating oil paintings

When granite rock hardens, it freezes radioactive elements in place.The most common radioactive element in granite is Uranium-238.Half of it will decay in about 5,730 years to form nitrogen.

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The helium still locked in the samples was studied as well as the rate at which the helium diffused from the rock.Plants take in carbon dioxide, incorporating in their tissues both carbon-14 (unstable) and normal carbon-12 (stable) in the same proportion as they occur in the atmosphere .Carbon-14 then moves up the various food chains to enter animal tissueagain, in about the same ratio carbon-14 has with carbon-12 in the atmosphere.Afterward, less carbon would be available to enter the atmosphere from decaying vegetation.With less carbon-12 to dilute the carbon-14 continually forming from nitrogen in the upper atmosphere, the ratio of carbon-14 to carbon-12 in the atmosphere would increase.

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