Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 44 Radioactive chemical elements and radioactive isotopes (including the fissile or 28 44 10 28 44 10 00 Commodity Code Description 28 44 10 00 00 - Natural uranium and its compounds; alloys, dispersions (including cermets), ceramic pr 28 44 20 00 00 - Uranium enriched in U 235 and its compounds; plutonium and its compounds; alloys, disp 28 44 30 00 00 - Uranium depleted in U 235 and its compounds; thorium and its compounds; alloys, disper 28 44 40 00 00 - Radioactive elements and isotopes and compounds other than those of subheading 2844.10 28 44 41 00 00 Tritium and its compounds; alloys, dispersions (including cermets), ceramic products and 28 44 42 00 00 Actinium-225, actinium-227, californium-253, curium-240, curium-241, curium-242, curium- 28 44 43 00 00 Other radioactive elements and isotopes and compounds; other alloys, dispersions (includ 28 44 44 00 00 Radioactive residues . 28 44 50 00 00 - Spent (irradiated) fuel elements (cartridges) of nuclear reactors