Preliminary radon survey in Greece (b)

A preliminary indoor radon survey in Greece based on 258 passive detectors, to test the technique andthe statistics, is presented. This paper is an extension of an initial survey (Geranios et al. 1999). Themajority of the detectors were placed in schoolrooms and dwellings for a yearlong (June 1997-June1998). The part of our sample concerning the northern region of Greece tends to indicate higher radonconcentrations than the rest part of the country. The radon concentration distribution fits well to thetheoretically expected lognormal. We have adopted a three level scheme to estimate the dose absorbedannually (0-99 Bq/m3, 100-200 Bq/m3 and >200 Bq/m3). Due to the small sample of detectors, weshould not interpret this map as characterising whole geographic areas, but simply indicating theradon concentrations at the particular sites.In order to complete a national radon survey, a much denser sample is certainly needed.