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Description
This study focuses on the measurement of radon concentrations in Veternica Cave, a karst cave system located at Medvednica Mountain, in the city of Zagreb – Croatia. This is the first time radon concentrations are being measured in Veternica Cave. Up to now the total of 6000 m of the cave has been explored, however only 380 m is available for visitors. These measurements involved systematic sampling of radon levels within visitor part of the cave. Passive radon detectors (SSNTD produced by Radosys) were used at 16 locations (exposure of 36 days). The average radon activity concentration (RAC) was 7394 ± 104 $Bqm^3$, and ranged 7254 to 7542 $Bqm^3$, with the highest RAC measured at the “Concert hall” location. The estimated effective dose for workers, taking into account the maximum possible time spent during visitors’ tours (300 h/year), was 15 mSv/year. The results indicate that detailed investigation, including seasonal variations is necessary to better estimate the radon fluctuation within the cave. The findings underscore the importance of continuous radon monitoring in underground environments, particularly those frequented by tourists, to mitigate potential health risks.