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A SURVEY TO MAP AREAS WITH ELEVATED INDOOR RADON LEVELS IN VENETO

F. Trotti, A. Tanferi, F.Bissolo, R. Fustegato, M. Lanciai, P. Mozzo, F. Predicatori, P.Querini, F. Righetti, A. Tacconi
CRR-ARPAV-Dipartimento di Verona - Ospedale Policlinico, via delle Menegone, 37134 Verona, Italy

CRR, the Regional Center for Radioactivity, is monitoring Veneto, a region in the north-east of Italy,
to trace a map of areas with elevated indoor radon levels. This survey is based on analysis of territorial
distribution of radon concentration in dwellings. Maps of potential risk are searched in the upper part
of the region based on the indication of a previous survey. Percentage of dwellings exceeding
reference levels are estimated on the base of log-normal data distribution. Normalizations to ground
floor or average housing type are produced. Preliminary results indicate the existence of three areas
with elevated indoor values. Radon levels often seem to be well correlated with geology.
Key words: Radon, mapping, Veneto, dwellings, grid rectangles, passive dosimeters