Soils from all over the province of Cáceres (Spain) were studied by gamma spectrometry to determine their 226Ra, 232Th and 40K concentrations. The rock types are fundamentally granites, shales and sedimentary materials. The analyses were designed for three different studies of the radionuclide concentration: at the surface, as a function of depth, and as a function of grain size.
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Baeza et al. (1992) studied this question.