ACTIVATION BY PROTONS IN RANGE-THICK LEAD AND TUNGSTEN SPALLATION TARGETS

The activation of spallation targets of Pb and W has been studied for range-thick targets at proton energies of 0.84, 1.00, and 1.42 GeV. Th e production of radioactive nuclei per incident proton pel cubic centi metre has been determined at six depths in the target material. Compar isons have been made with high-energy transport code calculations at 0 .84 and 1.00 GeV and with calculations for 800-MeV experiments using s imilar targets at Los Alamos National Laboratory.