Why dating of fossils is inaccurate

Next, the material will be washed under high temperatures using a solution that contains strong acidic and basic components to rid it of any impurities.The object is then set aflame and when it starts to emit fumes containing carbon dioxide, an accelerator mass spectrometer will be used to determine the amounts of carbon-14 decay.A new study found that radiocarbon dating may be inaccurate due to fossil fuel emissions.

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look like they have the same age for radiocarbon dating," Heather Graven of Imperial College London, lead author of an article detailing the study, said.

This is not the first time in modern history in which human activities are altering levels of carbon-14 in relics.

It is produced in the upper atmosphere by radiation from the sun.

(Specifically, neutrons hit nitrogen-14 atoms and transmute them to carbon.) Land plants, such as trees, get their carbon from carbon dioxide in the air. The same is true of any creature that gets its carbon by eating such plants. Suppose such a creature dies, and the body is preserved.

Dates up to this point in history are well documented for C14 calibration.

For object over 4,000 years old the method becomes very unreliable for the following reason: Objects older then 4,000 years run into a problem in that there are few if any known artifacts to be used as the standard.The C14 will undergo radioactive decay, and after 5730 years, half of it will be gone. So, if we find such a body, the amount of C14 in it will tell us how long ago it was alive. The method doesn't work on things which didn't get their carbon from the air.This leaves out aquatic creatures, since their carbon might (for example) come from dissolved carbonate rock.Ancient organic remains, such as oil and coal, are so old, they are nearly devoid of carbon-14.As carbon emissions from human-based activities continue, concentrations of carbon-14 will decrease, as the radioactive atoms are diluted from the pollution and the radiocarbon "age" of the atmosphere is artificially raised.It is also standard to coat fossils during their extraction and transport.

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