Radioatividade natural devido ao 210Po em águas subterrâneas de estâncias hidrominerais do sudeste brasileiro

• Autor(a) principal: Oliveira, Ana Maria Marinello Assis de [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203389; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-05-23/000914955.pdf
• topic: Radioatividade; Águas subterrâneas; Estações de águas; Ciclo hidrológico; Água - Qualidade; Água potável; Hidrogeologia; Chumbo; Polônio; Brasil, Sudeste; São Paulo (Estado); Minas Gerais

During the hydrological cycle, the water comes into contact with rocks that may contain minerals with radionuclides in their composition. These have been present on Earth since the earliest times, such as Uranium, Thorium and Potassium. The increasing presence of radionuclides in hydric resources due to technological processes, phosphate fertilizers, nuclear tests, effluent discharges in nuclear facilities, armed conflicts with nuclear artifact, or manufactured radioactive sources handling, led the World Health Organization to establish in the current legislation a list of elements for which reference values have been proposed for potable water consumption. Activity concentrations of 210Po and 210Pb in groundwater at São Paulo (SP) and Minas Gerais (MG) states were reported in this study with two purposes: different indices comparison to evaluate the radionuclides mobility in the waters and evaluate the potable water quality from the radiation doses calculations. The analyzed samples in this work are widely used for drinkable water in public places, bottling, bathing and others. These were collected in water springs and wells drilled in different aquifer systems inserted in the hydrogeological provinces of Paraná and Southeast Shield. The reference value of 0.1Bq / L established by WHO for 210Pb and 210Po was not reached for 210Pb, but the 210Po levels were equal to or greater than reference value in four Minas Gerais groundwater; the WHO maximum guideline dose level of 0.1 mSv / year was also achieved or exceeded. The 210Pb mobility indexes found results showed better usage to evaluate the processes that affect the radionuclides release in the liquid phase during the water / rock interactions