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Radiation Protection Dosimetry 82:147-149 (1999)
© 1999 Oxford University Press

Radon Concentrations in Kindergartens and Schools in the Lód_ Region of Poland

H. Bem, E.M. Bem and M. Ostrowska

Plastic Pico-Rad detectors with activated charcoal have been used for radon monitoring in local kindergartens and schools. Detectors were exposed for 48 h during winter in 309 rooms. The accuracy of the method has been checked by comparative studies in NITON (USA) and the experimental radon chamber in the Institute of Occupational Medicine in _ód_ (Poland). The results for this method differed from the average values for all participants by no more than 5%. The arithmetic and geometric means of indoor radon concentrations in these buildings were 17.9 and 13.0 Bq.m-3, respectively. No significant difference of Rn levels for the buildings from bricks (18.8 Bq.m-3) and those from lightweight concrete, containing fly ash (15.5 Bq.m-3) was found. The measured levels were relatively low, since the main source of indoor radon for these buildings is radon escaping from the underlying soil with a low 226Ra concentration (10-20 Bq.kg-1). The calculated annual effective dose from that source for children during their time at kindergarten or school is also very low, about 0.1 mSv.


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