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Abstract
A combination of angular distribution and energy spectra of sputtered atoms from amorphous UO2 material bombarded with Ar+ ions in the range 5-20 keV has given some insight into the relative importance of bulk and surface binding potentials in this material. For the energy spectra the data are well described over some 4 decades in energy by a theoretical model which includes both E B and E s terms. The surface binding term is constant at ∼1.4 eV throughout the range of argon ion energies but the effective bulk energy term EB varies from ∼3 to ∼30 eV.