Look up your local code for ice and water shield installation. (biggerpockets.com)
Most particles, such as the cosmic rays that constantly stream down onto Earth, would be stopped by the rock and water shielding around the detector, but WIMPs would be able to make it through — sometimes, if researchers are lucky, knocking into one of the densely packed xenon atoms in the detector and releasing a light signal along the way (liquid xenon is transparent to those photons). (scientificamerican.com)
The new instrument, containing 3.5 tons of ultra-pure noble gas Xenon cooled to nearly -140 degrees Fahrenheit to make it liquid, is installed inside a 10 - meter - wide water shield to protect it from radioactive background radiation. (ibtimes.com)