Uptake of 226Ra and 210Pb by food crops cultivated in a region of high natural radioactivity in Brazil |
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| Institution: | 1. Key Laboratory of Functional Organometallic Materials of College of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China;2. School of Civil and Environmental Engineering, and National International Cooperation Base on Environment and Energy, University of Science and Technology Beijing, Xueyuan Road No. 30, Haidian District, Beijing 100083, China;1. Collaborative Innovation Center of Advanced Functional Composites, Huaibei Normal University, Huaibei, 23500, People''s Republic of China;2. Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Key Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui Province, 230031, People''s Republic of China;3. School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei, 230022, People''s Republic of China;1. Institute of Civil Engineering, University of Applied Sciences Northwestern Switzerland;2. Department of Astronautic, Electric and Energetic, Sapienza University of Rome, via Eudossiana 18, Rome;1. Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yusong-gu, Daejeon 305-353, Republic of Korea;2. Environmental Engineering, Chungnam National University, 99 Daehak-ro, Yusong-gu, Daejeon 305-764, Republic of Korea |
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| Abstract: | The Poços de Caldas Plateau is a deeply weathered alkaline igneous intrusion of about 35 km diameter, in which several radioactive anomalies exist. The first Brazilian uranium mine and mill are located in this region. A study is in progress to assess the edible vegetable uptake of the most abundant natural radionuclides in the local environment and this paper reports the results for 226Ra and 210Pb. In farm soils, both nuclides have similar concentrations. The minimum values are comparable to those found in areas of normal radioactivity but the maximum concentrations are ten-fold higher. ‘Exchangeable’ radium in soils ranges from 2·3% to 34·5% of the total. No statistical correlation was found between the ‘exchangeable’ 226Ra and several physico-chemical soil parameters. In the vegetables analyzed, 226Ra concentrations are slightly higher than those of 210Pb and the maximum values are also one order of magnitude greater than in normal regions. For both radionuclides, the average soil-to-plant concentration factors are of the order of 10−3 and 10−2, when related to total and to ‘exchangeable’ contents in soils, respectively. For each vegetable, no statistical correlation was observed between the 226Ra or 210Pb concentrations in the plant (fresh weight) and concentrations in the soil, either total or ‘exchangeable’. The ‘exchangeable’ Ca in soils does not seem to influence radium uptake by plants in a defined way. |
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