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Indoor Radon Concentrations of School Buildings in Varna District, Bulgaria

Journal of Environmental Science and Engineering(B) 2022年第2期11卷 43-48页

作者： desislava djunakova Bistra Kunovska Jana Djounova Kremena Ivanova Zdenka Stojanovska National Centre of Radiobiology and Radiation Protection Sofia 1606Bulgaria Faculty of Medical Sciences Goce Delcev UniversityStip 2000Republic of North Macedonia

Radon is a radioactive gas that is naturally produced by the breakdown of uranium in soil,rock and *** International Commission on Radiological Protection(ICRP)and World Health Organization(WHO)requirements include controlling indoor radon exposure and settings of a reference level for the annual average activity concentration of up to 300 Bq/m3 for dwellings and public *** measurements in school buildings have long been carried out in many *** measurements in schools in Bulgaria have started and are *** study concerns the measurements of radon concentration(CRn)in all state school buildings in one of the Black Sea regions,Varna district,and the analysis of indoor *** survey of 1,185 premises of 107 schools was conducted from December 2019/January 2020 to March/May 2020 using a passive *** AM(Arithmetic Mean)of CRn in the premises of the studied schools on the territory of Varna district is 130 Bq/m^(3),and the geometric mean is 97 Bq/m^(3).The number of premises exceeding the national reference level of 300 Bq/m^(3) is 72 located in 38 schools(about 36% of schools).A statistically significant difference(KW(Kruskal-Wallis),p<0.0001)was found between the radon data,grouped by ***,the radon data were classified into two groups based on municipality location:on the Black Sea coast and *** located near the sea have a higher value of *** order to more accurately assess the exposure of pupils and teachers,the results are divided into four groups,depending on the type of use of the premises and the floor on which they are *** highest CRn value was found in the study rooms used for specialized education such as physics,chemistry,music etc.(AM=155 Bq/m3),which can be explained by their smaller size and less frequent use.A statistically significant difference(KW,p<0.0001)was found,which means that the radon exposure in the examined rooms depends on the type of use.T

关键词： Radon schools measurement classrooms Bulgaria

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