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Since the time of Libby, the developer of the C-14 analysis, calibration checks have been made using U. Counting tree rings showed that it had germinated in 2726 BCE.
This pushed the calibration back beyond recorded history almost to 10,000 BP (years before the present.) One valuable source of samples of various ages came from a bristlecone pine tree called "Methuselah" in the White-Inyo mountain range of California.
C-12 is by far the most common isotope, while only about one in a trillion carbon atoms is C-14.
C-14 is produced in the upper atmosphere when nitrogen-14 (N-14) is altered through the effects of cosmic radiation bombardment (a proton is displaced by a neutron effectively changing the nitrogen atom into a carbon isotope).
"Dendrochronologists [scientists who study tree rings] have built sequences for a number of tree species, including German, Irish and Polish oaks, Patagonian cypresses, Lebanese cedars, pine, yew, spruce, and chestnut.
They've plotted rings from shipwreck timbers and roof beams, and wood from the Mediterranean, Russia, and China.
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From that point onwards, the unstable carbon-14 decays with its half life of almost 5700 years, and the amount of carbon-12 remains the same.This technique works for objects that are up to 50,000 years old.This method of dating was introduced to the world by Willard Libby in 1949, and for this outstanding work, he was awarded the Nobel Prize in Chemistry in 1960.Carbon-14 is radioactive, and has a half life of about 5700 years.
Plants get their share of carbon atoms from the atmosphere. It is seen that at any given point of time, the ratio of stable carbon and radiocarbon in the atmosphere, is almost same as the ratio of stable carbon and radiocarbon in living organisms like plants, animals, and humans.
All living organisms and our environment are made of carbon.
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