[en] Neutron yields from proton bombardment of elemental Pb and depleted U have been measured at bombarding energies of 318 and 800 MeV. Additionally, at 800 MeV, data were obtained for Al and C. The data were obtained at two different angles/flight-paths and were collected in two parameter histograms of time-of-flight and pulse-height in order to select detector biases in the analysis and to permit comparison of calculated and experimental pulse height spectra in the calculation of detector efficiency. The data have been reduced to absolute double-differential cross sections and are in good agreement with INC calculations at 800 MeV but exceed calculation by a factor of three at the lower energy. (author)