When experts compare the tree-ring dates with the C dates, they find that radiocarbon ages before BC are really too young—not too old as Cook maintains. Pre-modern radiocarbon chronologies rely on standardized Northern and Southern Hemisphere calibration curves to obtain calendar dates from organic material. See Renfrew for more details. There is a sizable amount of time before and after that period that cannot be investigated using this method. The older an organism's remains are, the less beta radiation it emits because its C is steadily dwindling at a predictable rate. MG April 11th, This radiation cannot be totally eliminated from the laboratory, so one could probably get a "radiocarbon" date of fifty thousand years from a pure carbon-free piece of tin.
Thanks to Fossil Fuels, Carbon Dating Is in Jeopardy. One Scientist May Have an Easy Fix
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Radiocarbon Dating: A Closer Look At Its Main Flaws
See Bailey, Renfrew, and Encyclopedia Britannica for details. But other species produce scarcely any extra rings. During its lifetime, a plant is constantly taking in carbon from the atmosphere through photosynthesis.