Abstract
The purpose of this work is to present procedures for reconnaissance of soils, based on DC electrical resistivity measurements and gamma-ray spectrometry. The study area has 5 km 2 and is located in the Jardim Botânico de Brasília (Brazil), an environmental conservation area. In this area, resistivity measurements were obtained at 190 different points, and radiometric measurements (uranium, thorium, potassium, and total count) at 9 different points. Apparent resistivity values below 15000 Ohm.m were observed in clay soils and between 15000 and 30000 Ohm.m in sandy soils. It was also observed that radioactivity front clay soils is between 8000 and 14000 cps at total count, while in sandy soils, this value is below 800 cps. For the study area, although the clay soils are more radioactive, the K/U and K/Th ratios are higher in sandy soils. This fact can be related with differences in mineralogical composition of these materials. The processing of data produced an apparent resistivity map for the study area and its integration with radiometric data using a statistical procedure, the cluster analysis. The products of processing were compared with the soil map for to correlate the geophysical units with different kinds of soils.
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