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After plants and animals perish, however, they no longer replace molecules damaged by radiocarbon decay.
Instead, the radiocarbon atoms in their bodies slowly decay away, so the ratio of carbon-14 atoms to regular carbon atoms will steadily decrease over time (Figure 1c).
This carbon dioxide, now radioactive with carbon-14, is otherwise chemically indistinguishable from the normal carbon dioxide in the atmosphere, which is slightly lighter because it contains normal carbon-12.
Radioactive and non-radioactive carbon dioxide mix throughout the atmosphere, and dissolve into the oceans.
If the level is constant, living plants and animals should also maintain a constant carbon-14 level in them.
Radiocarbon then enters animals as they consume the plants (Figure 1b).Rb)—are not being formed on earth, as far as we know.Thus it appears that God probably created those elements when He made the original earth.So if we started with 2 million atoms of carbon-14 in our measured quantity of carbon, then the half-life of radiocarbon would be the time it takes for half, or 1 million, of those atoms to decay.The radiocarbon half-life or decay rate has been determined at 5,730 years.