In the present paper, results of an experimental gamma ray study of moisture transfer processes in porous material are reported. Evolution of moisture profiles in porous concrete samples during sorption and capillary moistening has been examined. Measured moisture profiles were used to determine, by the Boltzmann-Matano method, the coefficient of moisture diffusion versus Moisture content of the material under various moistening conditions. (c) 2008 Published by Elsevier Ltd.