Stop for radon in indoor air through adsorption

Important results from the project

Laboratory studies had previously demonstrated that the cTrap has a good ability to stop radon. The project aimed to examine which results that could be achieved in buildings with radon problems due to ´blue concrete´. The reduction of radon concentration was 18-19 % . It is known that radon molecules can easily traverse through even very small cracks or leaks, and does not bind to adsorbents as effectively as organic molecules. In further studies the cloth will be glued on the surface to ensure close contact between the radon molecules and the adsorbent aiming to improve the efficiency.

Expected long term effects

Installing the cTrap resulted in an 18-19 % reduction of the radon air concentrations. There is a very large number of buildings where a such a reduction would mean that the limit value of 200 Bq/m3 would be reached. In such cases, instead of increasing the ventilation, cTrap could be installed, with cost and energy savings as a result. In further studies on the use of cTrap for reducing radon concentrations, the cTrap cloth will be glued on the surface to ensure a close contact between the radon molecules and the adsorbent, and thereby achieve additional effect .

Approach and implementation

The project was implemented in cooperation with SP and Pure Solutions Scandinavia AB. Two rooms (with walls of ´blue concrete´) in a townhouse built in the 1960s were studied. In one room all walls were covered with the cTrap while in the other room one wall, with several closets, was left uncovered. Initial radon measurements were performed after the existing ventilation had been switched off and slots and cracks had been sealed . Then the cTrap was applied and finally additional radon measurements were carried out. Air exchange rates were controlled by the so-called pentiaq method.

External links

www.ctrap.se