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dos Santos Amaral, Romilton; de Paiva Melo, Niége Maria; dos Santos Júnior, José Araújo; da Silva, Arykerne Nascimento Casado; Correia, Filipe Lopes B.; Fernández, Zahily Herrero; Bezerra, Luís Rodrigo D.´Andrada; da Silva, Alberto Antônio; de Araújo Rodrigues Azevedo, Andrey José Isidoro
Environmental monitoring and assessment, 11/2022, Letnik: 194, Številka: 11Journal Article
The Metropolitan Region of Recife, the capital of the state of Pernambuco in northeastern Brazil, has a high demographic density and developed under a region of marine phosphorus with high concentrations of phosphate that naturally contains uranium ore, producing ionizing radiation from descendants of the radioisotope 238 U where 226 Ra and 210 Pb are of great importance in verifying the probable harmful effects on human health due to environmental radioactivity. The supply of drinking water is the responsibility of the state-owned company COMPESA which uses wells of great depth to complete the supply of drinking water for the entire population. COMPESA and the RAE Group of the Federal University of Pernambuco developed a joint project to assess the concentrations of 226 Ra and 210 Pb and estimate the equivalent and effective doses caused by ingesting these radiation sources. According to the above, this research aimed to evaluate concentrations of 226 Ra and 210 Pb in drinking water samples from 110 deep wells in Recife. The activities of 226 Ra and 210 Pb ranged from 1.4 ± 0.3 to 119.3 ± 12.9 and from 25.6 ± 3.3 to 563.2 ± 45.6 mBq.L −1 , with arithmetic means of 48.1 ± 3.8 and 231.1 ± 20 mBq.L −1 , respectively. The equivalent doses average in bone tissue due to 226 Ra and 210 Pb were 0.45 ± 0.04 and 3.9 ± 0.37 mSv.y −1 , and the annual average effective doses were 0.01 ± 0.00 and 0.13 ± 0.01 mSv.y −1 , respectively.
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