Radon measurements were carried out in four kindergartens in Slovakia. RSKS detectors (Radosys Ltd., Hungary) and RamaRn (SUJCHBO, Czech Republic) were used for integral measurement in indoor air. AlphaGUARD (Saphymo, Germany) and TERA system (Tesla, Czech Republic) were used for continual measurement in indoor air. An annual variation with a maximum during the summer holidays was observed. Daily variation strongly depended on the ventilation of rooms. The average radon activity concentration per unit of time calculated from integral measurements was higher than that calculated for working time only.
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