Our admin limits are 10% of the legal ones. So, for extremities, I use 500 mrem/month as an investigational trigger. That would allow some corrective action before the 5,000 mrem/year admin limit was exceeded. We tend to get higher hand doses from people using large amounts of P-32. Regards, John John Zummo, RSO Genentech, Inc. zummo@gene.com