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Instituto de Investigação
em Vulcanologia e Avaliação de Riscos

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Referência Bibliográfica

SILVA, C., FERREIRA, T., VIVEIROS, F., ALLARD, P.  (2014) - Monitorização dos teores de radão (222Rn) no ar interior de edifícios das freguesias das Furnas e Ribeira Quente (Vulcão das Furnas, Açores): avaliação do risco para a saúde pública. Comunicações Geológicas, 101, Especial II, 927-931. ISNN: 0873-948X; e-ISSN: 1647-581X.


​Furnas volcano is a polygenetic trachytic volcanic centre with caldera that shows secondary manifestations of volcanism, as recognized by the presence of fumarolic grounds, thermal springs, CO2-rich mineral waters and several soil diffuse degassing areas of carbon dioxide (CO2) and radon (222Rn). Radon is a radioactive gas that can be a potential threat to public health when inhaled in high concentrations for a long period of time. This is of special concern at Furnas Volcano, where Furnas and Ribeira Quente villages are both located within degassing areas. The indoor radon concentration was surveyed in some buildings of those villages. In each building two measurements were performed respectively in summer and winter periods in order to take into account the influence of meteorological conditions and building ventilation. The annual radon concentration range between 23 and 6403 Bq/m3. The level of indoor radon exceeds the limit defined by the regional legislation (150 Bq/m3) in 33% of the Furnas village buildings and in 21% of the ones of Ribeira Quente. Radon risk assessment for human exposure was assessed by integrating soil radon susceptibility and vulnerability maps. The resulting maps reveal that the majority of the buildings show a high to very high exposure risk to radon.