Release of Uranium by an Ore Treatment Unit at Caldas,MG,Brazil

作     者：Wagner de S.Pereira Alphonse Kelecom Juliana R.de S.Pereira Delcy de A.Py Junior 

作者机构：Multidisciplinary Group of Radioprotection(GMR)Servico de RadioprotecaoUnidade de Tratamento de MinerioIndustrias Nu-cleares do BrasilCaldasBrazil Laboratory of Radiobiology and Radiometry Pedro Lopes dos Santos(LARARA-PLS)Group of Environmental Themes Assessment(GETA)Universidade Federal Fluminense(UFF)NiteroiBrazil Interdisciplinary under Graduation in Science and TechnologyUniversidade Federal de AlfenasPocos de CaldasBrazil 

出 版 物：《Journal of Environmental Protection》 (环境保护（英文）)

年 卷 期：2013年第4卷第6期

页      面：570-574页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：Uranium Ore Treatment Unit Caldas Radionuclide Monitoring 

摘      要：This study aims to assess the behavior of the release of Unat (i.e. uranium isotopes in natural relative abundance) from the release of water treated by the Ore Treatment Unit (UTM) in Caldas, state of Minas Gerais, Brazil, during the years 1999 to 2009. During this period, the unit showed no industrial activity, except between 2004 and 2005, when UTM operated 400 tons of monazite in a process to obtain rare earths. Unat was analyzed by spectrophotometry once per week in the effluent waters at sampling point 014. Two fractions were considered for analysis: the soluble one (that passes through a 0.45 μm filter) and the particulate one (retained on a 0.45 μm filter). Statistical analyses were performed: the “Z test and Pearson’s r2 correlation index. The values for the soluble fraction were consistently lower than those of the particulate fraction and no statistically significant correlation was observed between the soluble and particulate fractions. However, the particulate and the total fractions (the sum of soluble and particulate) strongly correlated.