The authors acknowledge the support of the Consejo Superior de Investigaciónand the Facultad de Ciencias Físicas of the Universidad Nacional Mayor de SanMarcos, and of our Consejo Nacional de Ciencia y Tecnología, CONCYTEC, Perú. We are grateful to the personnel of our Mössbauer and Soils Laboratories for helpwith the equipment.

In this work a strategy for the estimation of absorption and scattering coefficients in one-dimensional participating media is presented. Media are considered with the absorption coefficient in the range [0.1 to 1.0] and the scattering coefficient between [0.1-1.0]. The direct problem was solved with the discrete ordinates and finite difference methods. In order to solve the inverse problem the following strategy consists of (a) find the absorption coefficient considering the scattering coefficient with an approximate value. 0.01, (b) find the scattering coefficient value using the absorption coefficient estimated in (a). The error function is defined as the difference between the measured value by the detector and the calculated by the direct problem. The algorithm used for the solution is to minimize the Bregman distance subject to the error function. Bregman distance was constructed w...