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Natural radioactivity assessment by gamma spectrometry in some commercially-used granites from Paraná State, Brazil: Preliminary results

Published online by Cambridge University Press:  09 January 2012

J. Barescut ,
D. Lariviere ,
T. Stocki ,
A.O. Ferreira  and
B.R.S. Pecequilo
A.O. Ferreira
Affiliation:
Environmental Radiometric Division, Instituto de Pesquisas Energéticas e Nucleares Av. Prof. Lineu Prestes, 2242, Cidade Universitária, 05508-000 São Paulo, SP, Brazil
B.R.S. Pecequilo
Affiliation:
Environmental Radiometric Division, Instituto de Pesquisas Energéticas e Nucleares Av. Prof. Lineu Prestes, 2242, Cidade Universitária, 05508-000 São Paulo, SP, Brazil
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Abstract

Natural radioactivity concentrations in commercially-used granites from Paraná state, Brazil, were measured in order to estimate the potential radiological hazard to mankind due to granite as an ornamental building material through the 226Ra, 232Th and 40K 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 226Ra, 7 ± 1 Bq kg−1 to 142 ± 6 Bq kg−1 for 232Th and 214 ± 14 Bq kg−1 to 1626 ± 77 Bq kg−1 for 40K. 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.

Type
Research Article
Information
Radioprotection , Volume 46 , Issue 6: ICRER 2011 – International Conference on Radioecology & Environmental Radioactivity: Environment & Nuclear Renaissance , 2011 , pp. S43 - S47
Copyright
© Owned by the authors, published by EDP Sciences, 2011

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