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It is widely used in dating fossils or archaeological samples containing organic material such as wood, charcoal, bone, shells, etc.
It is not used to date rocks or other inorganic material.
Although many people think radiocarbon is used to date rocks, it is limited to dating things that contain carbon and were once alive (fossils).
Radiocarbon (carbon-14 or C) forms continually today in the earth’s upper atmosphere.
The reasonableness of this assumption probably depends on the environment around the sample.
It is sometimes thought possible to extend the dating range a few half-lives, so one occasionally sees dates as old as 70,000 years or more.In most cases, the three methods produced similar results.Surprisingly, in at least one case the date range given by There may be other examples of systematic variation in isotope decay rates.Carbon-14 dating does not produce ages in the millions of years, as do some other types of radioisotope dating.
C dating consists of measuring the amounts of carbon-14 and carbon-12, and sometimes C-13, in a sample.Int Cal09 and Marine09 radiocarbon age calibration curves, 0-50,000 years cal BP.  This was the scroll “Testament of Qahat,” for which the radiocarbon date was about two centuries older than the date based on paleography. The most well-known of all the radiometric dating methods is radiocarbon dating.Violations of this assumption can frequently be identified.