Underwater Detectors (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption These four Daya Bay detectors are submerged in a pool of ultrapure water that helps to shield against naturally occurring radiation and is also used to detect cosmic muons. Credit Photo by Roy Kaltschmidt Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.