Carbon-14 dates usually appear to be reasonably accurate whenever they can be checked against historical records.
Hot live chat cam egypt free - Use of carbon 14 in carbon dating
A final assumption is that the various rates of flow of carbon-14 among the respective geophysical reservoirs must be constant, and the residence time of carbon-14 in the various reservoirs must be short relative to its half-life. (Riverside, CA: La Sierra University Press, 1997), 183. Carbon-14 dating models and experimental implications. Origins 24(2, 1997):50-64  The deep ocean waters are estimated to take about 1000 years to circulate back to the surface: Aitken, MJ.
If these three conditions are met, the initial concentration of C in the sample can be estimated.
Violations of this assumption can frequently be identified.
Three additional assumptions are necessary in radiocarbon dating in order to estimate the initial concentration of C could be caused by changes in the intensity of the cosmic radiation or in the strength of the earth’s magnetic field.
Carbon-14 dating cannot be applied to materials that have no C dates are less than that figure.