Alloys, such as: ----Superalloys, for parts in gas turbine aircraft engines. - ----Corrosion- and wear-resistant alloys. ----High speed steels. -Cemented carbides and diamond tools. -Magnets and magnetic recording media. ---Alnico magnets. -Catalysts for the petroleum and chemical industries. -Electroplating because of its appearance, hardness, and resistance to oxidation. -Drying agents for paints, varnishes, and inks. -Ground coats for porcelain enamels. -Pigments -Cobalt blue glass -Lithium ion battery electrodes. -Steel-belted radial tires. -Cobalt-60 has multiple uses as a gamma ray source: ----It is used in radiotherapy. ----It is used in radiation treatment of foods for sterilization . ----It is used in industrial radiography to detect structural flaws in metal parts. Co-60 is useful as a gamma ray source partially because it can be produced - in known quantity, and very large amounts - by simply exposing natural cobalt to neutrons in a reactor for a given time. -Use in medicine Cobalt-60 is a radioactive metal that is used in radiotherapy. It produces two gamma rays with energies of 1.17 MeV and 1.33 MeV. The 60Co source is about 2 cm in diameter and as a result produces a geometric penumbra, making the edge of the radiation field fuzzy. The metal has the unfortunate habit of producing a fine dust, causing problems with radiation protection. The 60Co source is useful for about 5 years but even after this point is still very radioactive, and so cobalt machines have fallen from favor in the Western world where linacs are common.