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Posted by / 14-Feb-2021 00:32

Wiki carbon dating

Once it dies, however, this exchange stops, and the amount of carbon-14 gradually decreases through radioactive beta decay with a half-life of 5,730±40 years.

When plants fix atmospheric carbon dioxide (COC that approximately matches the level of this isotope in the atmosphere (a small difference occurs because of isotope fractionation, but this is corrected after laboratory analysis).When these curves are used, their accuracy and shape are the factors that determine the accuracy and age obtained for a given sample.Plants take up atmospheric carbon dioxide by photosynthesis, and are ingested by animals, so every living thing is constantly exchanging carbon-14 with its environment as long as it lives.The radioactive decay of carbon-14 follows an exponential decay.A quantity is said to be subject to exponential decay if it decreases at a rate proportional to its value.

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The New Zealand curve is representative for the Southern Hemisphere, the Austrian curve is representative for the Northern Hemisphere.

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