Thanks everyone for your help. I appreciate the quick response Mutty Sharfi Internal Dosimetry BWO Mound sharmm@doe-md.gov (937)865-3423 office (937)865-3144 fax ************************************************************************ The RADSAFE Frequently Asked Questions list, archives and subscription information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html