title: Measurement of indoor radon concentration in kindergartens in Sofia, Bulgaria.
abstract: As a part of the systematic survey of indoor radon in Bulgaria, the indoor radon concentration was measured in 296 kindergarten buildings of Sofia city during 3 months (February to April 2013) using the CR-39 nuclear tract detectors. In 256 buildings at least two frequently occupied rooms (mainly playrooms) were observed. Altogether, 922 measurements were performed. The frequency distribution was well described by the lognormal function. The measured radon concentrations range between 9 and 1415 Bq m(-3) with a geometric mean of 101 Bq m(-3) (2.08) and an arithmetic mean 132 Bq m(-3) with a standard deviation of 118 Bq m(-3). The radon concentrations obtained in this survey were compared with that in Sofia city dwellings obtained from a previous study. A detailed statistical analysis of the building factors was presented.
authors: National Centre of Radiobiology and Radiation Protection, Building 7, 3 Sv. Georgi Sofiyski St., Sofia 1606, Bulgaria k.ivanova@ncrrp.org.
authors: Kremena
authors: K
authors: Ivanova
authors: Faculty of Medical Sciences, Goce Delcev University of Stip, 10-A Krste Misirkov St., Stip 2000, FYR of Macedonia.
authors: Zdenka
authors: Z
authors: Stojanovska
authors: National Centre of Radiobiology and Radiation Protection, Building 7, 3 Sv. Georgi Sofiyski St., Sofia 1606, Bulgaria.
authors: Martina
authors: M
authors: Tsenova
authors: National Centre of Radiobiology and Radiation Protection, Building 7, 3 Sv. Georgi Sofiyski St., Sofia 1606, Bulgaria.
authors: Viktor
authors: V
authors: Badulin
authors: National Centre of Radiobiology and Radiation Protection, Building 7, 3 Sv. Georgi Sofiyski St., Sofia 1606, Bulgaria.
authors: Bistra
authors: B
authors: Kunovska
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D002031:Bulgaria; D006801:Humans; D011092:Polyethylene Glycols; D011834:Radiation Monitoring; D011874:Radiometry; D011886:Radon / Q000032:analysis*; D012574:Schools
chemical_list: D000396:Air Pollutants, Radioactive; C028827:CR 39; D011092:Polyethylene Glycols; D011886:Radon