Radon counting with Bi-Po coincidence in liquid scintillator

Searches for rare events, such as double beta decays and dark matter particles, require extremely low background radioactivity. An important source of background radioactivity is radon outgassed from detector construction materials. To control this background source, materials whose outgassed radon may potentially induce background need to be assayed. One technique to identify radon is by observing its Bi-Po coincidence signature. Outgassed radon is loaded into a liquid scintillator (LS) medium which is then viewed by a photomultiplier tube looking for Bi-Po coincidences. This technique provides unambiguous identification of radon decays. In this talk, I will introduce the radon measurement facility at the University of Alabama that makes use of the above Bi-Po coincidence technique to detect radon.