The (222)Rn concentration in air was measured in a thermal water spa used as a hydrotherapy centre in Tunisia. The associated health risk for employees and patients due to the inhalation of (222)Rn and its progeny was estimated. A protection scheme for the employees of the spas has been designed. Results show that the (222)Rn concentration varies in the range 33-589 Bq m(-3). The (222)Rn concentrations measured in the present study show lower values in comparison to those reported for thermal spas in other countries. The (222)Rn concentration in different rooms of the spa depends mainly on the ventilation rate. A model based on a dosimetric approach was adopted to estimate the radon risk considering the (222)Rn concentration, the time spent in the spa, and the radioactive equilibrium factor F. The annual effective dose was found to vary between 0.2 and 1.7 mSv for workers while the range for patients was from 2.8 x 10(-4) to 1.1 x 10(-4) mSv. These values are within the ICRP recommended values.
L'étude des expositions associées à la présence du 222Rn dans les usines de traitement de phosphates et leurs enknnements naessite la mise en oeuvre d'un certain nombre de mesures dont les résultats devront ensuite être comparés aux recommandations de la CIPR dans sa publication 65. L'objectif de ces mesures est d'une part d'identifier les lieux qui peuvent présenter une exposition potentielle par la mesure de la concentration de radon 222 et d'autre part d'estimer cette exposition pour les travailleurs par la détermination de l'énergie alpha potentielle volumique. Le niveau de I'éner-pie alpha potentielle volumique à la surface du dépôt de phosphogypse << tahia» dépasse les recommandations de la CWR dans certains points de mesure.
RÉSUMÉABSTRACT Estimation of the exposure related to the presence of radon 222 indoor phosphate treatmen factories and their environments in Tunisia. The study of the exposures linked to the existance of 2LZRn in the factories of phosphate treatment and their environment, needs implementation of some special measumnents which muth should be compamd with ICRP recommendations. The objective of these measurements is to identify the sites that couid present a potentiel expusure, hy measuring radon 222 concentration. On the other hand, it is to estimate this risk by identifying the alpha potential energy. In some cases the alpha potential energy level on the surface of phosphogyps storage can exceed the ICRP recommendations.
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