[en] The results of the CAI_UMA Project are herein presented, the purpose of which was to quantify the average annual radon concentration in the university education sector by comparing it with current regulations and to estimate the consequent radiological risk. Radon 222Rn measurements were taken in five classrooms from March 2019 to April 2020. 222Rn is a naturally occurring radioactive noble gas belonging to the decay chain of uranium 238U. Measurements were taken using 5 Saphymo® AlphaE active monitors and 70 CR-39® passive detectors and developed at the Radioactivity Laboratory of the University of Cantabria (LARUC). The average annual concentration was 59 Bq/m3. These results match those predicted in national studies such as the Radon Potential Map, the Natural Gamma Radiation Map (MARNA) and the lithostratigraphic and permeability map and in existing radon measurement studies. The effective dose at the University of Malaga (UMA) due to indoor radon exposure for members of the public was determined for the first time: 0.80 mSv/yr. These concentrations do not exceed the legal reference level, although monthly average values above 300 Bq/m3 were measured in certain months. This can be ascribed to poor ventilation and to the accumulation of gas inside the classrooms via various pathways. Quantifying average annual 222Rn concentrations allows the radiological risk to be assessed and compared to reference levels, the risk being low. The goal of informing the public and raising its awareness of the risks of radon exposure was thus achieved.

[pt] Apresentam-se os resultados do projeto CAI_UMA, cujo objetivo foi quantificar a concentração média anual de radão no setor do ensino universitário, comparando-a com as normas vigentes, estimando o risco radiológico derivado. Desde março de 2019 até abril de 2020, realizaram-se medições de Radão 222Rn em cinco salas de aula. 222Rn é um gás nobre radioativo de origem natural, pertencente à cadeia de desintegração do Uranio 238U. As medições foram realizadas com 5 detetores ativos Saphymo® AlphaE e 70 passivos CR-39®, revelados no Laboratório de Radioatividade da Universidade de Cantábria (LARUC). A concentração média anual foi de 59 Bq/m3. Esses resultados são consistentes com os previstos em estudos nacionais como; o mapa do potencial de radão, o mapa de radiação Gama Natural (MARNA), o mapa litoestratigráfico e de permeabilidade, bem como os estudos existentes de medições de radão. Determina-se pela primeira vez na Universidade de Málaga (UMA) a dose efetiva por exposição a radão interior para o público: 0,80 mSv/ano. Estas concentrações não excedem o nível de referência normativo, embora em determinados meses sejam obtidos valores médios mensais acima de 300 Bq/m3. Estes valores podem dever-se a uma ventilação deficiente e à acumulação de gás dentro das salas de aula devido a vários motivos. Quantificar as concentrações anuais médias de 222Rn permite estimar o risco radiológico, comparando-o com os níveis de referência, resultando em baixo risco. O objetivo de informar e conscientizar a sociedade sobre os riscos da exposição ao radão é assim alcançado.