BNL - 66660 DEVELOPMENTS IN SYNCHROTRON X-RAY COMPUTED MICROTOMOGRAPHY AT THE NATIONAL SYNCHROTRON LIGHT SOURCE B. A. Dowd, Graham H. Campbell and D. Peter Siddons Brookhaven National Laboratory National Synchrotron Light Source Upton, NY 11973-5000 Robert B. Marr Department of Applied Science Brookhaven National Laboratory National Synchrotron Light Source Upton, NY 11973-5000 Vivek Nagarkar and Sameer Tipnis Radiation Monitoring Devices, Inc. 44 Hunt Street Wartertown, MA 02472 Lisa Axe New Jersey Institute of Tech. Dpt. Of Civil & Environmental Eng. Newark, NJ 07102 July 1999 National Synchrotron Light Source Operated by Brookhaven Science Associates Upton, NY 11973 Under Contract with the United States Department of Energy Contract Number DE-AC02-98CH10886