PROJETO AEROGEOFÍSICO SERRA DO MAR SUL: UMA ABORDAGEM SEMI-QUANTITATIVA

Several airbome surveys have been promoted in Brazil by the Departamento Nacional da Produo Mineral (DNPM). Nevertheless, due to DNPM priorities, the obtained flown records are not optimized to allow more than semi-quantitative levei details. The methodology and data processing of airborne gamma-ray spectrometry in Brazil, hs not reached the evolution obtained in other countries, mainly due to brazilian peculiar geological characteristics, which often limit data interpretation. Here, a re-evaluation of Serra do Mar Sul airborne gamma-ray spectrometry data is presented. Flown profles records were re-processed, optimized and tested for potentiality analysis. Correlations between countings in different recording channels were highly improved by the adopted procedures. A terrestrial survey, using a portable gamma-ray spectrometer calibrated at the Comisso Nacional de Energia Nuclear (CNEN-RJ), was performed in order to establish a correspondence between counts and concentration for U, Th and K.