Abstract
The 222Rn concentration in air was measured in a thermal water spa used as a hydrotherapy centre inTunisia. The associated health risk for employees and patients due to the inhalation of222Rn and its progeny was estimated. A protection scheme for theemployees of the spas has been designed. Results show that the222Rn concentration variesin the range 33–589 Bq m−3. The 222Rn concentrations measured in the present study show lower values incomparison to those reported for thermal spas in other countries. The222Rn concentration in different rooms of the spa depends mainly on the ventilation rate. A modelbased on a dosimetric approach was adopted to estimate the radon risk considering the222Rn concentration, the time spent in the spa, and the radioactive equilibrium factorF. Theannual effective dose was found to vary between 0.2 and 1.7 mSv for workers while the range for patientswas from 2.8 × 10−4 to 1.1 × 10−4 mSv. These values are within the ICRP recommended values.
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