The temperature dependence of adsorption coefficients of 222Rn on activated charcoal: an experimental study

The radon adsorption coefficient of activated charcoal (K) has exponential relationship with temperature theoretically, but few experiment results of K at temperature below 0 ℃ were given. In this study, K were measured using a flow-through system with activated charcoal in cylindrical adsorption beds at temperature adjusted from room temperature to −48 °C using liquid nitrogen. Results are consistent with theory and show that the adsorption coefficient at −48 °C is nearly 25 times higher than that at 23 ℃.