Elevated radon concentrations, several times above permissible levels, were detected in three rooms at SP No. 5 in Jelenia Góra, Poland, prompting repeat testing.
Radon Exceeds Permissible Levels
Radon levels were found to exceed permissible limits in three rooms at Primary School No. 5 in Jelenia Góra. Repeat measurements will be conducted under conditions that more accurately reflect exposure to the radioactive gas.
The Jelenia Góra area is known for its naturally occurring higher radon concentrations.
Measurement Details
Measurements of the radon isotope, using dosimeters from the Prof. J. Nofer Institute of Occupational Medicine, were carried out at the school from late January to early March. Exceedances were recorded in two classrooms and the gymnasium, according to Marcin Ryłko, spokesperson for the Jelenia Góra City Hall.
Concentration Levels and Re-Testing
The permissible radon level is 300 Bq/m³, but concentrations in the measured rooms exceeded 2000 Bq/m³. The initial measurements are being repeated because they were taken under conditions not representative of typical exposure – during school closures and without ventilation.
Mitigation Efforts Underway
The school has implemented measures to potentially reduce radon concentrations, including basement renovations with radon-resistant hydro-isolation and a new floor. A rotational schedule for using classrooms 1 and 3, as well as the gymnasium, has been introduced, along with a ventilation schedule for these rooms. An opinion on the safety of using the affected rooms has been requested from the sanitary-epidemiological station.
Institute Assessment
The Prof. J. Nofer Institute of Occupational Medicine, in its analysis of the measurements, stated that the actions taken by the school administration are appropriate and consistent with recommendations to limit exposure.
Regional Radon Presence
Jelenia Góra and surrounding areas are located in a region with naturally higher radon concentrations. Radon is a colorless, odorless radioactive gas that enters buildings from the ground and accumulates in lower levels.