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For example, Christian time counts the birth of Christ as the beginning, AD 1 (Anno Domini); everything that occurred before Christ is counted backwards from AD as BC (Before Christ).The Greeks consider the first Olympic Games as the beginning or 776 BC.The numbers refer to the atomic weight, so Carbon-12 has 6 protons and 6 neutrons, Carbon-13 has 6 protons and 7 neutrons, and Carbon-14 has 6 protons and 8 neutrons.The extra neutrons in Carbon-14’s case make it radioactive (thus the term, radiocarbon).

The Mayan calendar used 3114 BC as their reference.

It is good for dating for the last 50,000 years to about 400 years ago and can create chronologies for areas that previously lacked calendars.

In 1949, American chemist Willard Libby, who worked on the development of the atomic bomb, published the first set of radiocarbon dates.

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.




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