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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Proteção Radiológica - SBPR
2018
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| Online Access: | https://www.redalyc.org/articulo.oa?id=722280821003 |
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Table of Contents:
- Dose estimation and calculation of radiological hazard index at Doce River / Brazil due to Fundão dam rupture Roberto Ferreira Carmo Heitor Evangelista José Ubiratan Delgado Octávio Luis Trindade Filho Araceli Verónica Flores Nardy Ribeiro Joselito Nardy Ribeiro Madsom de Godoi Pereira Marcus Vinícius Licínio Biología NORM Doce River dam of Fundão radiological risk natural radioactivity Radionuclide activity monitoring of the natural occurrence of 226Ra, 228Ra and 40K is important in order to assess the radiological impact and human exposure due to natural radioactivity. Surface concentrations of these radionuclides may change due to soil use, urbanization or deforestation. In November 2015, a rupture of a tailings dam in the upper course of Doce River, in the Southeastern part of Brazil, caused a catastrophic environmental hazard -the greatest accident in a mineral area in the Southern Hemisphere. In this work, we developed a prospective evaluation of radioactivity levels in sediments of the Doce River obtained from its estuary before and after the dam rupture. Activities were analyzed by high resolution gamma spectrometry for 226Ra, 228Ra and 40K. Results ranged from 15.86 ± 0.99, 19.83 ± 1.10 and 237.15 ± 8.70 Bq.kg-1 for before the rupture and 20.70 ± 0.99, 31.82 ± 1.30 and 197.50 ± 7.62 Bq.kg-1 for the period after, respectively. This study identified a significant elevation of 226Ra, 228Ra activities after the rupture. We also evaluated the annual effective dose equivalent to the local population and the radiological risk index, both internally and externally. The results obtained for the radiological risk to the local population were compared with worldwide values. 2018 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280821003 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2 Vol.6