Law and Estimation Method of Radon Concentration in Closed Space

Recently, nature radiation has got more attention, also including the impact of radon and its daughters. The change rate of radon concentration relates to radon exhalation rates and back-diffusion in a closed space. But now, the researches on the radon exhalation rate are much more than the back-diffusion coefficient. We discussed the theoretical equation of the concentration of radon in a closed space and the influence of back-diffusion. In this paper, We detected the concentration of radon in a closed space. Based on the experimental data, the characteristics of back-diffusion are discussed. By comparing the theoretical equation with the measured data, the relationship between the radon concentration and the precipitation rate and the back-diffusion coefficient is verified. The results provide a reference for the analysis and estimation of radon concentration in closed spaces such as indoors or mines.