14c carbon 14 for dating prehistoric findings
The living organisms naturally abide in this carbon filled environment and once it dies it is automatically removed from this environment.
Then the organism will then start to lose a certain amount of 14C. The 14C age determination is based on the measurement of the residual 14C activity in a sample compared to the activity of a sample of an assumed zero ago from the same environment and era.
The precautions taken to avoid these contaminations are to completely removing what was assumed non-present when the original sample died.
Furthermore, the accuracy of the radiocarbon determination are from the production of 14C by cosmic rays they need to be constantly long enough to establish a steady state, there has been a complete and rapid mixing of 14C throughout the carbon environments, the carbon isotope ratio in the sample has not been changed excepted for the 14C decay and finally the total amount of carbon in any environment has not been changed.
The raw 'uncalibrated' radiocarbon ages are given in radiocarbon years before the present day (BP) but these do not equate directly to actual calendar years due to variations in atmospheric carbon over time.
Many people have been led to believe that radiometric dating methods have proved the earth to be billions of years old.
Radiocarbon dating is the process of measuring the amount of carbon-14 isotope remaining in an organic material and from this measurement the age of the sample can be calculated.
Carbon-14 (14C) is incorporated into plants when they photosynthesize carbon dioxide from the atmosphere.
Archaeological Research Services Ltd in collaboration with English Heritage have been at the forefront of recent developments including the use of Bayesian probability modelling to date the internationally renowned Mesolithic house site at Howick.
ARS Ltd provides a complete radiocarbon dating service including assistance with sample selection, analysis, calibration and, if appropriate, Bayesian mathematical modelling.