Time filter

Source Type

Araujo dos Santos Junior J.,Grupo de Radioecologia RAE | dos Santos Amaral R.,Grupo de Radioecologia RAE | Simoes Cezar Menezes R.,Grupo de Radioecologia RAE | Simoes Cezar Menezes R.,Federal University of Pernambuco | And 7 more authors.
Ecotoxicology and Environmental Safety | Year: 2017

One of the main natural uranium deposits in Brazil is located in the municipality of Espinharas, in the State of Paraíba. This area may present high levels of natural radioactivity due to the presence of these radionuclides. Since this is a populated area, there is need for a radioecological dosimetry assessment to investigate the possible risks to the population. Based on this problem, the objective of this study was to estimate the environmental effective dose outdoors in inhabited areas influenced by the uranium deposit, using the specific activities of equivalent uranium, equivalent thorium and 40K and conversion factors. The environmental assessment was carried using gamma spectroscopy in sixty-two points within the municipality, with a high-resolution gamma spectrometer with HPGe semiconductor detector and Be window. The results obtained ranged from 0.01 to 19.11 mSv y−1, with an average of 2.64 mSv y−1. These levels are, on average, 23 times higher than UNSCEAR reference levels and up to 273 times the reference value of the earth's crust for primordial radionuclides. Therefore, given the high radioactivity levels found, we conclude that there is need for further investigation to evaluate the levels of radioactivity in indoor environments, which will reflect more closely the risks of the local population. © 2017 Elsevier Inc.


Silva C.M.,Grupo de Radioecologia RAE | Amaral R.S.,Grupo de Radioecologia RAE | Ribeiro F.C.A.,Brazilian Northeast Regional Center of Nuclear Science (CRCN-NE) | Tabosa J.N.,Grupo de Radioecologia RAE | And 2 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2011

The lead (Pb) isotopes 206Pb and 208Pb are the final products of the radioactive decay of 238U and 232Th, respectively. Soils in the municipalities of Pedra and Venturosa, Brazil, present high levels of these radionuclides. We hypothesized that forage plants growing in these soils may take up high amounts of Pb and, consequently, intoxicate dairy cows. To test this, we quantified Pb concentrations in 23 forage samples from this region. Pb concentrations varied from 5 to 344 mg kg -1. The highest values are one order of magnitude above the reported limit, therefore, indicating high risk of Pb contamination for dairy cows. © 2011 Springer Science+Business Media, LLC.


Silva C.M.,Grupo de Radioecologia RAE | Amaral R.S.,Grupo de Radioecologia RAE | Tabosa J.N.,Grupo de Radioecologia RAE | Junior J.A.S.,Grupo de Radioecologia RAE | And 2 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2010

210Pb is widely distributed in the environment. In this context, the aim of this research has been: (1) to determine 210Pb concentrations in milk and dairy products from farms located in the cities of Pedra and Venturosa in Pernambuco, Brazil; and (2) to calculate the dose due to the ingestion of 210Pb in these products. The ion exchange resin method was used and the concentration of 210Pb varied from 62 to 650 mBq l -1 in fresh milk, from 202 to 1,494 mBq kg -1 in curdled cheese and from 11 to 253 mBq l -1 in milk whey. The estimated dose due to ingestion of milk and dairy products in this region was 0.2 Sv, which is at least two orders of magnitude above the maximum recommended levels. © 2010 Springer Science+Business Media, LLC.

Loading Grupo de Radioecologia RAE collaborators
Loading Grupo de Radioecologia RAE collaborators