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 De of radon in the soil in this experiment is 1.8 x 10-6 +/- 6.6 x 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,...
