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 isotopes 28 44 Radioactive elements and isotopes and compounds other than those of Subheading 2844.. 28 44 43 Other radio active elements and isotopes and compounds; other alloys, dispersions (in Commodity Code Description 28 44 43 00 Other radio active elements and isotopes and compounds; other alloys, dispersions (in