Lux Detector Water Shield

Once underground, the natural radioactivity from people, the walls of the laboratory, and the rock itself are enough to make the detector go off hundreds of times a second. To eliminate this radioactivity, Gaitskell and his team will immerse the detector into an eight-meter diameter tank of highly purified water. This multilayered strategy of putting the detector below ground and immersing it in water allows for an extremely low background event rate in their detector.