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.

中文翻译：

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匈牙利幼儿园的室内氡水平

研究了匈牙利 10 个不同县 76 个镇的 88 所幼儿园的年平均室内氡活动浓度。幼儿园室内氡活度年均浓度为 61 Bq m− 3，最大值为 160 Bq m− 3。幼儿园氡的季节变化不像住宅那么强烈，因为幼儿园常年通风，封闭期暑假。