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For the most part, radiocarbon dating has made a huge difference for archaeologists everywhere, but the process does have a few flaws.For example, if an object touches some organic material (like, say, your hand), it can test younger than it really is.But as more dates became available, Egyptologists, who had hieroglyphic records back thousands of years, began to recognize that C-14 dates were generally too young.They proved this by showing that C-14 dates of wooden artifacts with cartouches (dated royal names) did not agree. The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.Libby received the Nobel Prize in Chemistry for his work in 1960.Until this century, relative dating was the only technique for identifying the age of a truly ancient object.

The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.

Fortunately, Willard Libby, a scientist who would later win the 1960 Nobel Prize in Chemistry, developed the process known as radiocarbon dating in the late 1940s. In a nutshell, it works like this: After an organism dies, it stops absorbing carbon-14, so the radioactive isotope starts to decay and is not replenished.

Archaeologists can then measure the amount of carbon-14 compared to the stable isotope carbon-12 and determine how old an item is.

C is created in the atmosphere by cosmic radiation and is taken up by plants and animals as long as they live.

Upon death, the isotope begins to decay and after 5730±40 years half of it is gone.

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