Study on the radon removal performance of low background activated carbon

Radon and radon daughters pose significant backgrounds to rare-event searching experiments. Activated carbon has very strong adsorption capacity for radon, while the internal $^{226}$Ra concentration ultimately limit its radon removal ability. In order to measure the intrinsic background and study the radon removal capacity of Saratech activated carbon at various temperature, a radon emanation measurement system with a high sensitive radon detector and an adsorption performance research system have been developed. In this paper, the detail of two systems and measurement results of Saratech activated carbon will be presented.