Question
Tue November 27, 2012 By:

14C dating reliably

Expert Reply
Tue November 27, 2012
Objects older than about 50,000 years usually can't be tested accurately, because the carbon-14 levels have decayed beyond recognition. Radiocarbon dating, which can only be used on organic remains, is also sometimes inaccurate because of fluctuations in the balance between atmospheric carbon-14 and carbon-12 over the millennia. This can be affected by an organism's specific environment or its diet.
Ask the Expert