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The period of time that it takes for half of a sample to decay is called a "half-life." Radiocarbon oxidizes (that is, it combines with oxygen) and enters the biosphere through natural processes like breathing and eating.Plants and animals naturally incorporate both the abundant C-12 isotope and the much rarer radiocarbon isotope into their tissues in about the same proportions as the two occur in the atmosphere during their lifetimes.We also know that the ratio decreased during the industrial revolution due to the dramatic increase of CO produced by factories.This man-made fluctuation wasn't a natural occurrence, but it demonstrates the fact that fluctuation is possible and that a period of natural upheaval upon the earth could greatly affect the ratio.

is carbon 12 a dating method-56

This is how carbon dating works: Carbon is a naturally abundant element found in the atmosphere, in the earth, in the oceans, and in every living creature.

Unfortunately, we aren't able to reliably date artifacts beyond several thousand years.

Scientists have tried to extend confidence in the carbon dating method further back in time by calibrating the method using tree ring dating.

Carbon dating is somewhat accurate because we are able to determine what the ratio was in the unobservable past to a certain extent.

By taking a carboniferous specimen of known age (that is, a specimen which we are able to date with reasonable certainty through some archaeological means), scientists are able to determine what the ratio was during a specimen's lifetime.




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