Use of carbon 14 dating
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.There are exceptions to the theories and relationships introduced below that are beyond the scope of this discussion.Carbon is the basis of life and is present in all living things.
From that time forward, the only process at work in the body is radioactive decay.
After 50,000 years, a fossil won’t have any radiocarbon left in it.
Carbon-14 will have all disappeared by radioactive decay.
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.
Thus all the carbon-14 in the product comes from the biobased component.
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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.