Laboratory study on the relationship between the vertical distribution of radon concentration in soil and the exhalation rate of radon from the soil surface

In this paper, One-dimensional diffusion of radon in the natural environment was used to simulate by a simple device. According to experimental results, combined with Fick’s law, it can be fitted that the effective diffusion coefficient D_e of radon in the soil in this experiment is 1.8 × 10^–6 ± 6.6 × 10^–7 m²s⁻¹, the soil radon equilibrium concentration is 25.1 ± 2.4 kBq/m³, the radon exhalation rate on the soil surface is 47 ± 17 mBqm⁻² s⁻¹. The radon exhalation rate of soil surface was measured twice by an accumulation chamber, the measured results are similar to the calculated results.