A passivated uranium surface has been tested as an electron-spin analyzing target in a retarding potential Mott detector. The effective Sherman function and yield were measured for electron energies of 15–34 keV at energy-loss acceptance windows of 500 and 1000 eV. The figure of merit was found to be ≊1×10−5. The uranium target had a higher Sherman function than either gold or thorium at 20-keV and 500-eV energy loss. The passivated surface is also extremely stable, thus proving to be an acceptable target for electron-spin analysis.