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Krypton is a chemical element with the symbol Kr and atomic number 36. A colorless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionating liquefied air, and is often used with other rare gases in fluorescent lamps. Krypton is inert for most practical purposes but it is known to form compounds with fluorine. Krypton can also form clathrates with water when atoms of it are trapped in a lattice of the water molecules.
Originally posted by Mirthful Me My bet is that the radioactive material came from test equipment, possibly NDI (Non Destructive Investigation) equipment.