Abstract
An ancient monastery placed in Ponte de Lima, an inner village in Alto Minho region, North of Portugal, was monitored in order to assess radon gas concentrations. The aim of this paper is to perform a short-term radon gas characterization to assess the radon risk in a school building and therefore propose adequate mitigation strategies. The experimental campaign took place during spring and summer of 2017 and was carried out in 2 complementary steps involving 17 different sites. This study revealed that the radon concentration levels are above the legal limit of 400 Bq.m-3, in 77% of the samples. The value rises to 86% when Euratom Directive limit of 300 Bq.m-3 is considered. Furthermore, the results obtained that indoor radon concentration varies with the occupancy of the rooms, since it is evident that the human ventilation actions have a considerable impact on the reduction of its concentration.
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