Indoor radon (222Rn) was surveyed in a total of 141 individual houses and apartments used precalibrated passive PicoRad Detectors. The radon activity in the soil gas around the dwellings was simultaneously measured. The arithmetic mean values of indoor radon concentrations for detached houses, old buildings (up to four-stories), prefabricated blocks of flats (mostly five stories) and high-rise residential buildings (10-stories) were:, 70.9; 46.5; 38.4, and 56.6 Bq m−3, respectively. The average arithmetic mean value for all measured rooms equals 51.8 Bq m−3. The calculated average effective dose from indoor radon for the local population was equal to 2.2 mSv.

中文翻译：

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波兰 Kalisz 不同类型建筑的室内氡 (Rn-222) 进入和浓度调查

使用预校准的无源 PicoRad 探测器对总共 141 所独立房屋和公寓的室内氡 (222Rn) 进行了调查。同时测量了住宅周围土壤气体中的氡活度。独立式住宅、旧建筑（最多四层）、装配式公寓（主要是五层）和高层住宅（10层）的室内氡浓度算术平均值为：，70.9；46.5; 分别为 38.4 和 56.6 Bq m-3。所有测量房间的平均算术平均值等于 51.8 Bq m-3。计算出的室内氡对当地居民的平均有效剂量等于 2.2 毫希沃特。