What's the most recent release of this document? Is it Revision 2, effective July 1, 1989? Thanks. Albert Lee Vest The Ohio State University Health Physicist Room 103 1314 Kinnear Road Bldg (614)292-1284 1314 Kinnear Road avest@magnus.acs.ohio-state.edu Columbus OH 43212 My employer did not review or approve this message.