Clearly, various centers of civilization arose independently of one another even if the Near Eastern one remains the oldest on record.
) and is instantantly mixed throughout the atmosphere.
There are also significant plateaus in the curves, such as the one from 11000 to 10000 radiocarbon years BP, which is believed to be associated with changing ocean circulation during the Younger Dryas period.
It is known that half-life of radiocarbon is years.
At radiocarbon dating laboratory could be measured the amount of remaining radiocarbon relative to the stable one which dont change in concentration.
As carbon dioxide is used as the basis for photosynthesis, the radiocarbon is integrated into all living things.
As far as plant or animal dies, the radiocarbon decays.
Later a more accurate figure of 5730 -40 years was measured, which is known as the Cambridge half-life.
However laboratories continue to use the Libby figure to avoid confusion.Such wood, turned into an artifact some time after the death of the tree, will reflect the date of the carbon in the wood. This limit is encountered when the radioactivity of the residual 14C in a sample is too low to be distinguished from the background radiation.The K-Ar and uranium decay series are used in dating older objects (see Radiometric dating).This is the number of radiocarbon years before 1950, based on a nominal (and assumed constant - see "calibration" below) level of carbon-14 in the atmosphere equal to the 1950 level.labs generally report an uncertainty, e.g., 3000 -30BP indicates a standard deviation of 30 radiocarbon years.The highest rate of carbon-14 production takes place at altitudes of 30,000 to 50,000 feet, and at higher geomagnetic latitudes, but the carbon-14 spreads evenly throughout the atmosphere and reacts with oxygen to form carbon dioxide.