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 Lodz (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.
Mots-clés Pascal : Pologne, Europe, Dosimétrie, Radon, Monitorage, Détecteur rayonnement, Précision, Etablissement scolaire, Charbon actif, Contrôle qualité
Mots-clés Pascal anglais : Poland, Europe, Dosimetry, Radon, Monitoring, Radiation detector, Accuracy, Educational facility, Activated carbon, Quality control
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0246456
Code Inist : 002A08F05. Création : 16/11/1999.