Souza, Raquel Franco deAlbuquerque, Bruno César Dias de2022-08-182022-08-182022-02-24ALBUQUERQUE, Bruno César Dias de. Radioatividade natural: instrumentos legais e normativos no Brasil e interações do radônio outdoor com variáveis micrometeorológicas no planalto da Borborema. 2022. 126f. Tese (Doutorado em Desenvolvimento e Meio Ambiente) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/49186Radon is a colorless and odorless radioactive gas, the heaviest of all noble gases of natural origin. Rocks and soils with high concentrations of Uranium and Thorium are the main sources of Radon. Research has proven its carcinogenic power. There are studies that try to establish relations between aspects that can influence the concentration of the gas into the atmosphere. In Brazil the theme is little investigated and, in terms of legislation, it is restricted to the exploration of Uranium and Nuclear Energy. In this context, the study aimed to answer three hypotheses: the Brazilian legislation is outdated in relation to natural radioactivity and needs to consider aspects related to the theme; the micrometeorological variables (temperature, air humidity, solar radiation and winds) explain the pattern of 222Rn concentration in Cuité and Bananeiras, municipalities of the State of Paraíba; the photosynthetically active vegetation biomass explains the pattern of 222Rn concentration in Cuité and Bananeiras, in diverse climatic periods. The main objectives of the research were: to evaluate how the Brazilian legislation and the environmental standards address the natural radioactivity in different geochemical compartments, and to evaluate if the micrometeorological variables and the variation of photosynthetically active vegetation biomass explain the pattern of Radon concentration, in the rainy and dry seasons. For this, the thesis was divided into three articles, which respectively follow the sequence of the listed hypotheses. In the first article (chapter 1) bibliographic and documental research was used, where the methodology of systematic mapping for environmental sciences was employed; it was concluded that the Brazilian legislation is incipient regarding natural radioactivity and that there are gaps regarding the radioactivity present in environmental compartments. The second article (chapter 2) shows results of passive measurements of 222Rn concentration in the low atmosphere and micrometeorological variables during the rainy season in Bananeiras and Cuité. A statistical model of multiple linear regression was applied, which indicated individual significance of the variables wind (negative relationship) and solar radiation (positive relationship); the model analysis showed that the 222Rn concentration can indeed be influenced, but in a punctual way, without evidence of predictive relationship in the context of the variables studied. In the third article (chapter 3), to understand other factors of influence on the concentration of 222Rn and its variation in different climatic periods, passive radon measurements were also made in Bananeiras and Cuité, during the dry period, besides the sampling and analysis of soil and rock samples, and vegetation analysis by means of vegetation indices. In the comparison with the 222Rn data measured in the rainy period (article 2), no significant variations in the averages were observed. Vegetation analysis by means of vegetation indices (NDVI) and site visits showed significant differences in the areas in the different climatic periods, but there was no evidence of any influence on the concentrations of 222Rn. The results suggest that the slightly higher values of 222Rn measured in Bananeiras in the two periods may have been influenced by soil particle size, higher vegetation density, and meteorological parameters (solar radiation, temperature, and wind) that suggest less dispersion of the gas in comparison with Cuité. In summary, when analyzing in general the hypotheses raised, the micrometeorological variables and the variations that occurred in different climatic periods were apparently not able to overlap with the background radioactivity profile for each location.Acesso AbertoRadioatividade naturalRadônioVariáveis micrometeorológicasLegislação ambientalRegressão linear múltiplaMonitoramento ambientaldoctoralThesisCNPQ::CIENCIAS BIOLOGICAS