All in all the lab stands on these dates for the Julsrud material, whatever that means in terms of archeological dating in Mexico, or in terms of 'fakes verse's authentic' pieces. Despite the amount of attention given to the exclusion of contamination by isolation and purification of specific chemical and, most recently, molecular fractions of bone, a tradition of skepticism concerning the general reliability of bone 14 C values remains eg, Brown For older datasets an offset of about 50 years has been estimated. Definitions, mechanisms and prospects" PDF. Radiocarbon ages were plotted against the carbon mass for each sample Fig. This was news to him, and contradicted prior statements and documents from the university.
The reliability of the results can be improved by lengthening the testing time.
Radiocarbon Dating Bones
A separate issue, related to re-use, is that of lengthy use, or delayed deposition. Vienna, IAEA, — McGraw-Hill, Conventions for Reporting Radiocarbon Determinations. Radiocarbon dating has transformed our understanding of the past 50, years. However, it has been hard to reach the public with the information.