Influence of humidity on activated carbon fabrics scheduled for use in high sensitivity radon detectors

Breakthrough on radon individual monitoring and protecting miners by novel dual-function monitor on respirator

“… As discussed above, the ACF due to its tissue texture nature is expected not to be too dependent on moisture, as discussed in the text before; This dependency has yet to be determined in anothed project. However, a recent study by comparing two types of ACF, namely ACC-5092–10 and ACC-5092–20, with different adsorbed water content from zero to saturated level 36 , demonstrated that radon adsorption in ACC-5092–10 smoothly and monotonically decreases with the increase of adsorbed water and at saturation level it is lower by a factor of 2.5 as compared to the fully dehydrated material. On the other hand, in ACC-5092–20 a clear break point was observed at water content of about 20% where radon adsorption sharply drops by a factor of 15.…”

“…On the other hand, in ACC-5092–20 a clear break point was observed at water content of about 20% where radon adsorption sharply drops by a factor of 15. Therefore, ACC-5092–10 was recommended as a material that keeps its high radon adsorption ability even when saturated with water to be used for sensitive long-term 222 Rn measurements even at high levels of humidity 36 . However, the moisture dependence of the radon collection efficiency in this monitor has not been studied or even experimentally researched, what needs to be further determined.…”