A survey of radon concentration in kindergartens in area of town Piekary ?l?skie, affected byunderground mining, have been performed. Measurements were done in cellars and classrooms on thegroundfloor. The highest value of radon concentration in the classroom during long-term monitoringwas of about 228 Bq/m3. During the survey we proved a correlation between concentrations of radonin soil gas and in buildings.
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