A national radon survey is still lacking for Greece. Some Groups have done several more or lesslocal or extended radon surveys and valuable experience has been gained (Anagnostakis et al.1996, Papastefanou et al. 1997, Louizi 1997). After the first preliminary survey done by ourgroup (Geranios et al.
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.
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