Maria de Lurdes Dinis participated in the conference RAD 2018: The Sixth International Conference on Radiation and Application in Various Fiedds of Research, at Ohrid, Macedonia (FYROM), 18-22 June 2018

 The purpose of the present study was to evaluate the radon concentration in natural mineral waters of 17 Portuguese thermal establishments. The evaluation was carried out between 2013 and 2015 for several places of each thermal establishment. An analysis of the compliance between the obtained values and the existing legal requirements for the different parameters, in what concerns to radon concentration in water, was made. The results showed the presence of anomalous values sometimes higher, both at the reference level and at the action limit. Approximately 50% of the obtained results are higher than the reference level recommended by the EU, while 20% of the results exceeded the action limit. These results may also imply high concentrations of indoor radon (and hence occupational exposure to radon) since the natural mineral water will be a continuous source of this radionuclide. The high values obtained in some cases are worrying and show the need of a more detailed and extensive study, both in space and time.