Verification of different approaches for determining the exhalation rate of ²²²Rn from soil for the estimation of CO₂ exhalation

In this work, the authors deal with the verification of different approaches for determining the exhalation rate of ²²²Rn from the soil using the most widespread theoretical relations, the values of which are subsequently used to calculate the exhalation rate of CO₂ using radon calibrated method (RKM). Both types of results, i.e. calculated exhalation rates of ²²²Rn and CO₂ are compared with their measured values obtained from long-term exhalation measurements using the accumulation method carried out on the same area during one year. The calculated values of exhalation rates fluctuate significantly in the short term depending on meteorological elements such as temperature or soil moisture, or on the concentration of ²²²Rn and CO₂ in the soil, but in a wider time span these trends smooth out. (authors)