Before Aperture Science became a worldwide leader in Science, they were a worldwide leader in shower curtains. In fact, the majority of Cave Johnson's wealth was amassed thanks to contracts with the U.S. military to provide shower curtains to military bases. Rumor has it, Cave was exposed to high levels of mercury while developing deadly shower curtains for the House Naval Appropriations committee.
This shower curtain, while emblazoned with the Aperture Science logo, probably doesn't contain mercury or radiation. Not if you’re in the control group at least. (Pssst, you're in the control group.)
Officially licensed and approved by Valve!
Get squeaky clean behind this Aperture Labs shower curtain
White vinyl(EVA) shower curtain with black Aperture Labs logo
Features the aperture logo and text letting you know that it "Contains less than 1% mercury"
Most likely not radioactive (but wear your lead underwear anyway)