Section 06 Products of the chemical or allied Industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes 28 44 Radioactive chemical elements and radioactive isotopes (including the fissile or fertile chemical elements and isotopes) and their compounds; mixtures and residues containing these products. Commodity Code Description 28 44 10 Natural uranium and its compounds, etc 28 44 20 Uranium enriched in U235 and its compounds; plutonium and its compounds; alloys, disp 28 44 30 Depleted uranium and thorium and their compounds, etc 28 44 40 Radioactive elements and isotopes and componds other than those of subheading 2844.1 28 44 50 Spent (irradiated) fuel elements (cartridges) of nuclear reactors