Carbon 13 isotope dating
These socalled "solidcarbon" dates were soon found to yield ages somewhat younger than expected, and there were many other technical problems associated with sample preparation and the operation of the counters.
Chemical methods for separating the organic (collagen) from the inorganic (apatite) components of bone created the opportunity to date both components and compare the results.Bases may be used to remove contaminating humic acids.Some types of samples require more extensive pretreatment than others, and these methods have evolved over the first 50 years of radiocarbon dating.The diminishing levels via decay means that the effective limit for using c14 to estimate time is about 50,000 years. Subsequent work has shown that the halflife of radiocarbon is actually 5730 ± 40 years, a difference of 3% compared to the Libby halflife.
Carbon 13 isotope dating comments 

Carbon Dating facts, information, pictures.
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The method
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Explainer what is radiocarbon dating and how does it work?
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Carbon Dating Definition, What is Carbon14 14C Dating?
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