"Not for use on primary coolant loops of liquid sodium-cooled reactors. Product does not constitute OSHA-approved shielding against gamma radiation. Backing color may appear to change when illuminated by Cherenkov radiation. Product neither catalyzes the development of, nor blocks the use of, mutant super powers. ..."
https://www.walmart.com/ip/3M-Performance-Plus-Duct-Tape-897...