I recall learning about quite a few other chemical/radioactive tests whilst in archaeology school - not just radiocarbon - do you have stats on those as well? I get kind of nervous myself whenever radiocarbon is used as the definitive test for paleological specimens...seems we are dealing with completely different chemical and radiological factors.
Radiocarbon only goes back some 50,000 years. Older samples, and samples not containing carbon, require other methods.
Here is a link I posted earlier that has some good information:
Radiometric Dating: A Christian Perspective by Dr. Roger C. Wiens.