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Scientists have developed calibration techniques to adjust for these fluctuations.

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The numbers of C14 atoms and non-radioactive carbon atoms remain approximately the same over time during the organism’s life.

As soon as a plant or animal dies, the carbon uptake stops.

It is likely that, by the pyramid age, the Egyptians had been intensively exploiting wood for fuel for a long time.

Because of the scarcity and expense of wood, the Egyptians would reuse pieces of wood as much as possible.

Ancient baking left deposits of ash and charcoal, which are very useful for dating.

The 1995 set of radiocarbon dates tended to be 100 to 200 years older than the dates, which was about 200 years younger than our 1984 dates.We wanted to use science to test the accepted historical dates of several Old Kingdom monuments.One radioactive, or unstable, carbon isotope is C14, which decays over time and therefore provides scientists with a kind of clock for measuring the age of organic material.Archaeologists believe Egypt’s large pyramids are the work of the Old Kingdom society that rose to prominence in the Nile Valley after 3000 B. Historical analysis tells us that the Egyptians built the Giza Pyramids in a span of 85 years between 25 BC.Interest in Egyptian chronology is widespread in both popular and scholarly circles.The radioactive carbon isotope is no longer replenished; it only decays.

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