Laboratory study on the effects of environmental temperature and soil moisture content on soil surface radon exhalation rate

Abstract This study investigates the combined effects of environmental temperature (26℃–31℃) and soil moisture content (40%–45%) on the soil radon exhalation rate. By using a controlled laboratory simulation to minimize outdoor field interferences, this research precisely isolates and quantifies the independent and synergistic impacts of these variables. Results reveal that moisture is the dominant inhibitory factor, while temperature strongly promotes radon exhalation. Furthermore, elevated temperatures significantly alleviate the inhibitory effect of soil moisture. This novel quantification provides an accurate reference basis for assessing how environmental parameter combinations dynamically govern radon risk.