Laboratory study on the influence of environmental parameters on soil surface radon exhalation rate

In this study, a laboratory soil column device was constructed to simulate the radon diffusion process. The soil surface radon exhalation rate was measured continuously for two weeks using RAD7 instrument, while five environmental parameters were recorded synchronously. Multiple Linear Regression was employed to quantify the influence of these parameters on soil surface radon exhalation rate. Standardized regression coefficients (Beta) revealed that all five parameters significantly affect radon exhalation rate. Specifically, soil temperature exhibited the strongest negative impact (Beta = -0.70) within the range of 23.2°C-29.3 °C, followed by atmospheric pressure (Beta = -0.59) and environmental temperature (Beta = -0.36, 20.8°C-31.2 °C). Soil moisture showed the most significant positive impact (Beta = 0.42, 5.3%-9.9%), while environmental humidity exerted a moderate positive effect (Beta = 0.34, 38.0%-84.5%). Subsequently, the Bootstrap sampling method was used to conduct 1000 repetitions of sampling for supplementary analysis. It verified the reliability and robustness of the coefficients obtained from the Multiple Linear Regression model. These findings provide a scientific basis for regional radon risk assessment, the optimization of radon measurement protocols, and indoor exposure reduction, while also offering insights for geological early warning systems and uranium exploration.