Seasonal variation of radon and CO₂ in the Važecká Cave, Slovakia

The continuous monitoring of ²²²Rn activity concentration, CO₂ concentration, and microclimatologic parameters (internal air temperature and relative humidity) in the Važecká Cave (Northern Slovakia) is being carried out at three monitoring stations, namely, Gallery, Lake Hall, and Entrance Hall. Radon activity concentration and CO₂ concentration exhibited a clear annual variation. The daily average of radon concentration ranged 1300–27 700 Bq/m³ at the Lake Hall station and 3600–42 200 Bq/m³ at the Gallery station. Radon reached its maximum in the summer months, from June to September. The annual maximum of CO₂ concentration is registered approximately one month later than radon maximum. The annual variation of radon and CO₂ is controlled by the seasonal change of ventilation regime associated with the seasonal variation of the difference between the temperature measured inside the cave and the atmospheric temperature.