Response: I asked several people who know about this field. Their responses are numbered below. C14 dating is very accurate for wood used up to about 4, years ago. This is only because it is well calibrated with objects of known age.
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The Story of Carbon Dating
Carbon dating accuracy called into question after major flaw discovery
Radiocarbon, or Carbon, dating is probably one of the most widely used and best known absolute dating methods. It was developed by J. Arnold and W. Libby in , and has become an indispensable part of the archaeologist's tool kit since. It's development revolutionized archaeology by providing a means of dating deposits independent of artifacts and local stratigraphic sequences. This allowed for the establishment of world-wide chronologies. Where does C Come From?
Willard Libby and Radiocarbon Dating
Radiocarbon dating of soils has always been a tricky problem. Since organic matter is continually being introduced into the soil, the measured age of soil organic matter has always tended to underestimate the true age of the soil. Carbon exists in the most part in the isotope C, but has a radioactive isotope, C, with a half-life of years.
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