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Radiocarbon dating can be used on samples of bone, cloth, wood and plant fibers.
The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.
Carbon-14 is constantly be generated in the atmosphere and cycled through the carbon and nitrogen cycles.
Once an organism is decoupled from these cycles (i.e., death), then the carbon-14 decays until essentially gone.
Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.
At any particular time all living organisms have approximately the same ratio of carbon 12 to carbon 14 in their tissues.
They found a form, isotope, of Carbon that contained 8 neutrons and 6 protons.He demonstrated the accuracy of radiocarbon dating by accurately estimating the age of wood from a series of samples for which the age was known, including an ancient Egyptian royal barge dating from 1850 BCE.