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When a creature dies, it ceases to consume more radiocarbon while the C-14 already in its body continues to decay back into nitrogen. The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.The World Ocean Circulation Experiment (WOCE) The World Ocean Circulation Experiment (WOCE); at the Woods Hole Oceanographic Institution's NOSAMS Facility.Measuring carbon in the Pacific and Indian Ocean to understand better the processes of ocean circulation.There are over forty such techniques, each using a different radioactive element or a different way of measuring them.It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.C-12 is by far the most common isotope, while only about one in a trillion carbon atoms is C-14.

Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.The new isotope is called "radiocarbon" because it is radioactive, though it is not dangerous.It is naturally unstable and so it will spontaneously decay back into N-14 after a period of time.It takes about 5,730 years for half of a sample of radiocarbon to decay back into nitrogen.It takes another 5,730 for half of the remainder to decay, and then another 5,730 for half of what's left then to decay and so on.

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