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In the Campos Gerais region of Parana there are few literature that evaluate the concentrations of natural radioactivity. Thus, the aim of the present work was to determine activity concentrations of 226 Ra, 232 Th, 40 K and 222 Rn concentration in soil samples from Telemaco Borba, Tibagi, Curiuva, Ventania, Lageado Bonito and Ortigueira. The soil samples, with about 2 kg, were collected on the surface at points near the river bed, making sure that the soil is not under the agriculture influence. Gamma-ray spectrometry analyzes were performed with a NaI(Tl) scintillation detector, with dimensions of 76 mm in diameter, 152 mm in height and 8 cm of lead shield. The 222 Rn concentration determinations were performed by means of the sealed can technique, using as track detector a polycarbonate of domestic manufacture. The results obtained for the activity concentration varied from |
