6Th Meeting on Shielding Aspects of Accelerators, Targets and Irradiation Facilities (Satif-6), Date: APR 10-12, 2002, Location: Menlo Pk, CA, Sponsors: OECD Nucl Energy Agcy, Stanford Linear Accelerator Ctr, Radiat Safety Informat Computat Ctr, Reactor Phys Comm Japan, Shielding Working Grp