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It is naturally unstable and so it will spontaneously decay back into N-14 after a period of time.

­ ­You probably have seen or read news stories about fascinating ancient artifacts.Scientists have developed calibration techniques to adjust for these fluctuations.While alive, all plants and animals take C14 into their bodies.The earliest experiments in radiocarbon dating were done on ancient material from Egypt. Libby’s team obtained acacia wood from the 3rd Dynasty Step Pyramid of Djoser to test a hypothesis they had developed.Libby reasoned that since the half-life of C years, the Djoser sample’s C14 concentration should be about 50% of the concentration found in living wood (for further details, see Arnold and Libby, 1949). Subsequent work with radiocarbon testing raised questions about the fluctuation of atmospheric C14 over time.The different isotopes of carbon do not differ appreciably in their chemical properties.