| Radiological characterisation of disposed phosphogypsum in Brazil: evaluation of the occupational exposure and environmental impact. | |
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MedLine Citation:
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PMID: 16531459 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Phosphogypsum, a waste by-product derived from the wet process production of phosphoric acid, represents a serious problem facing the phosphate industry in Brazil. This by-product (mainly calcium sulphate dihydrate) precipitates during the reaction of sulphuric acid with phosphate rock and is stored at a rate of about 4x10(6) kg per day on several piles in Cubatão, Brazil. Contents of natural radionuclides from thorium and uranium series were measured in Brazilian phosphogypsum samples from disposal piles, using high-resolution gamma ray spectrometry and instrumental neutron activation analysis (NAA). These phosphogypsum piles present a potential threat to the surrounding environment and to the individual occupationally exposed. The results obtained in this study show that radionuclides, although present in relatively high concentrations in phosphogypsum, do not imply in significant doses for individuals occupationally exposed. The results obtained for the water activity in the monitor wells showed that the run-off of the piles is influenced by the activity present in the piles, giving indication of a possible groundwater contamination. Sediments from rivers in the area of influence of the pile presented higher concentrations of 238U and 232Th when compared with reference values. |
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Authors:
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A J G Santos; P S C Silva; B P Mazzilli; D I T Fávaro |
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Publication Detail:
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Type: Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't Date: 2006-03-10 |
Journal Detail:
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Title: Radiation protection dosimetry Volume: 121 ISSN: 0144-8420 ISO Abbreviation: Radiat Prot Dosimetry Publication Date: 2006 |
Date Detail:
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Created Date: 2006-12-04 Completed Date: 2007-03-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8109958 Medline TA: Radiat Prot Dosimetry Country: England |
Other Details:
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Languages: eng Pagination: 179-85 Citation Subset: IM |
Affiliation:
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Instituto de Pesquisas Energéticas e Nucleares, Laboratório de Radiometria Ambiental, IPEN, Brazil. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Brazil Calcium Sulfate / analysis* Environment* Occupational Exposure* Phosphates / analysis Phosphorus / analysis* Radioisotopes / analysis Spectrometry, Gamma Thorium / analysis Uranium / analysis |
| Chemical | |
Reg. No./Substance:
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0/Phosphates; 0/Radioisotopes; 13397-24-5/phosphogypsum; 7440-29-1/Thorium; 7440-61-1/Uranium; 7723-14-0/Phosphorus; 7778-18-9/Calcium Sulfate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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