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This leaves the amount in the air relatively constant.Radiocarbon immediately reacts with oxygen in the air to form carbon dioxide (CO2).Radiocarbon dating uses carbon-14 to determine the last time something (or someone) was alive.Carbon-14 originates in the upper atmosphere of the earth and is created when neutrons originating from solar radiation bombardment collide with nitrogen in the air.Petroleum and dinosaur bones are examples of fossil materials that no longer have carbon-14 remaining in them.Radiocarbon dating is applicable to biobased content measurements in manufactured products because they contain some combination of recently living materials and fossil materials.The standard developed for this purpose is called ASTM D6866.Recently living materials (the biobased component) have Carbon-14 in them while fossil materials (derived from petroleum) no longer have this weakly radioactive carbon isotope.

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Eventually, all the carbon-14 in the remains will disappear.

Carbon-14 is present in all living things in minute amounts.

Since it is radioactive, it gradually fades away by radioactive decay until it is all gone.

This principle applies equally to a person dying, a corn stalk being cut down, or to a soybean plant being pulled out of the ground.

When they stop living, they stop taking in carbon-14 from the air around them, and the amount of carbon-14 in the remains gradually disappears.Other Topics: ASTM D6866 Carbon Dating Concepts Biobased Content Terms and Definitions USDA Bio Preferred Program Biobased Content Terms and Definitions The term biobased is typically applied only to materials containing carbon.

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