Rutherford back-scattering and nuclear reactions were used to study the concentration profiles of elements in oxidized samples of PbSe. An interpretation of experimental data in the context of the theory of diffusion over the grain boundaries was suggestedDetermination of the Oxygen Diffusion Profile in Polycrystalline Lead Selenide Layers Using Nuclear Microanalysis. A.E.Gamarts, V.M.Lebedev, V.A.Moshnikov, D.B.Chesnokova: Semiconductors, 2004, 38[10], 1160-3