Don't forget that there was one system of radiation units used world-wide before SI units came out. I think there is a resentment against a small committee decreeing that the whole world should change the units it was accustomed to using. Bernard L. Cohen Physics Dept. University of Pittsburgh Pittsburgh, PA 15260 Tel: (412)624-9245 Fax: (412)624-9163 e-mail: blc+@pitt.edu