200
Very inaccurate for very small and very old samples, destructive method of dating, and inaccurate due to the fluctuations of C14 in the atmosphere.
What are the problems with radiocarbon dating?
Michaels, George H., and Brian M. Fagan. "Exercise 1-2: Chronological Methods."Chronological Methods 8 - Radiocarbon Dating. The Regents of The University of California, 22 July 2013. Web. 9 Mar. 2016.