Abstract
Natural radioactivity concentrations in commercially-used granites from Parana state, Brazil, were measured in order to estimate the potential radiological hazard to mankind due to granite as an ornamental building material through the 226 Ra, 232 Th and 40 K activities concentrations measured in several samples by high-resolution gamma-ray spectroscopy. Preliminary results, without considering samples self-attenuation, show activities concentrations varying from 4 ± 1 Bq kg−1 to 79 ± 3 Bq kg−1 for 226 Ra, 7 ± 1 Bq kg−1 to 142 ± 6 Bq kg−1 for 232 Th and 214 ± 14 Bq kg−1 to 1626 ± 77 Bq kg−1 for 40 K. All results are within the range of literature values for similar rocks. Further, the annual effective dose, the radium equivalent activity and the external and internal hazard indexes will be assessed.
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