Radiocarbon dating test
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.A reaction occurs and a tiny number of these collisions convert nitrogen to carbon-14.Their bodies are said to be in “equilibrium” with carbon-14 in the air.Although carbon-14 is radioactively decaying away in the body, it is constantly being replaced by new photosynthesis or the ingestion of food, leaving the amount relatively constant.
The standard developed for this purpose is called ASTM D6866.
This carbon-14 immediately starts to radioactively decay but is constantly being recreated.
This leaves the amount in the air relatively constant.
Eventually, all the carbon-14 in the remains will disappear.
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.
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Radiocarbon, or carbon-14 (also written as C), is an isotope of carbon that is unstable and weakly radioactive.