Avaliação dos níveis de concentração de radônio em águas de poços, rochas e solos em Carambeí-PR

• Ano de defesa: 2021
• Autor(a) principal: Oliveira, Monique Soares de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Curitiba; Brasil; Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial; UTFPR
• Palavras-chave em Português: Radioatividade - Medição - Carambeí (PR); Poços; Rochas - Análise; Solos - Análise; Radônio; Água - Qualidade - Medição; Radioactivity - Measurement - Carambeí (PR); Wells; Rocks - Analysis; Soils - Analysis; Radon; Water quality - Measurement; CNPQ::ENGENHARIAS::ENGENHARIA BIOMEDICA; Engenharia Elétrica
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/26657

Human exposure to natural radiation, especially 222Rn gas, due to the harm that this radiation causes in relation to public health, highlights the importance of research on radon. Although the quality control of water distributed to the population is an established public health issue, there are no radon measurement protocols. There is an influence of the type of soil and rocks in the concentration of radon in well water, as soils rich in uranium and thorium, consequently, release radon that difuses to the adjacent water. Therefore, it is important to performe research in order to contraibute to the knowledge of water quality in relation to radon consumed by the population that use well water. The rural area of Carambeí, in the state of Paraná, has several farms whose residents use well water as a source of drinking water. Thus, it is considered that the evaluation of radon in well water, rocks and soils in the region is relevant. The objective of this work is to evaluate the radon concentration in well waters, rocks and soils in the region of Carambeí, in the state of Paraná – Brazil, and thus contribute to a database for the National Radon Program on the coordination of the Geological Survey of Brazil (CPRM). The points of interest for collecting water and rock samples and also local soil measurements focused on properties that have wells. Samples of water were collected from local wells and also from rocks found around the homes in the locations planned for measurement. Local soil radon measurements were also performed. The analyzes were done at the Laboratory of Applied Nuclear Physics (LFNA) of the Federal University of Technology – Paraná – Brazil. The results of ²²6Ra concentrations found in well water samples were in the range of 0.3±0.3 Bq/L to 3.8±2.3 Bq/L, of which about 64% of these samples are above the value 0.5 Bq/L, which is the limit for alpha emission. In the same samples, 222Rn concentrations ranging from 0.4±0.8 Bq/L to 87±13 Bq/L were found, and about 81% of the samples also presented values above 0.5 Bq/L. In the case of supported radon concentrations, generated by 226Ra, it is estimated that the contribution to the interior of environments that make use of these well waters can be a public health problem. The levels of ²²²Rn concentration in granitic rocks ranged from 1141±26 Bq/m³ to 53.7±1.6 Bq/m³. Concentration calculations were performed simulating that these rocks are based in a UNSCEAR standard room. In the case where the granitic rock concentration was above the established limits, the contribution to the standard room does not exceed the recommended values. The results of measurements of radionuclides ²²²Rn and 220Rn in the soil show concentrations in the range of 18.4±4.1 kBq/m³ to 208±21 kBq/m³ and 27±8 kBq/m³ to 188.4±0.9 kBq/m³, for each isotope, respectively. The values found in this research serve as a basis for the National Radon Program and allow us to observe that there is a public health issue, mainly related to the amount of radium, and consequently indoor radon, in homes or environments that use this water for consumption.