Abstract
Annual average indoor radon activity concentration was studied in 88 Hungarian kindergartens in 76 towns of 10 different counties. Annual average indoor radon activity concentration in the kindergartens was 61 Bq m− 3, maximum was 160 Bq m− 3. In the kindergartens the seasonal variation of radon is not so strong like in dwellings, because of the permanent ventilation and the closed period during the summer break.
Highlights
The main part of the natural background radiation is from the radon (Rn-222) isotope, which is a colorless, odorless and chemically inert noble gas
In this study we examined 88 kindergartens in 76 towns in the middle and western part of the country (Fig. 1) to check if there is any of them which has radon concentration above the reference level, 300 Bq m − 3 in Hungary
None of the studied 88 kindergartens in the 76 towns had higher than 300 Bq m
Summary
The main part of the natural background radiation is from the radon (Rn-222) isotope, which is a colorless, odorless and chemically inert noble gas. The World Health Organization (WHO) identified the radon as the second leading cause of the lung cancer after the smoking [6]. In order to reduce the lung cancer risk several international organizations published recommendation about the acceptable indoor radon concentration. In the actual recommendation of the European Union (which is the same as the International Atomic Energy Agency’s recommendation) the reference level of indoor radon concentration is 300 Bq
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