Construction of a low-temperature activated carbon radon adsorption system using air cooler

Underground low-background laboratories have a very large demand for radon reduction in their working environments. Therefore, in this paper, we have constructed a system for low-temperature activated carbon adsorption of radon by using air cooler and measured the dynamic adsorption coefficients of activated carbon on radon at room temperature and at a low temperature below − 50 °C. The experimental results show that the activated carbon dynamic adsorption coefficient reaches 688.79 L/g at a temperature of − 63.35 °C and a pressure of 3.5 atmospheres, which is more than 70 times higher than that at room temperature. During the experiments, problems of effective regulation were identified that need to be further addressed.