Contamination dating radiocarbon
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As explained below, the radiocarbon date tells us when the organism was alive (not when the material was used).This fact should always be remembered when using radiocarbon dates.Radiocarbon dates can be obtained from many types of organic material including charcoal, shell, wood, bone and hair.The amount of carbon dioxide in the living organism is equal to that in the atmosphere.Further complications arise when the carbon in a sample has not taken a straightforward route from the atmosphere to the organism and thence to the measured sample.
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The net effect of this is that all living organisms have the same radiocarbon to stable carbon ratio as the atmosphere.
Radiocarbon dating is a widely applied absolute dating method in archeology.
It is based on the knowledge that living organisms build up their own organic matter by photosynthesis or by using atmospheric carbon dioxide.
with a standard deviation of plus or minus 120 years, the chances are two in three that that sample dates from between 1120 and 880 BC.
Here's how: Calculations based on one standard deviation of 120 years: 1000 120 = 1120 BC (Oldest date) 1000 - 120 = 880 BC (Most recent date) To increase the range of possible dates of a sample, archeologists may calculate the radiocarbon date to two standard deviations.
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