Heading 2844 · Section VI
2844 Radioactive chemical elements and radioactive isotopes (including the fissile or fertile chemical elements and isotopes); and their compounds; mixtures and residues containing these products
Subheadings 8
2844.10 Natural uranium and its compounds, alloys, dispersions (including cermets), ceramic products and mixtures containing natural uranium or natural uranium compounds 2844.20 Enriched in U235, plutonium, their compounds, alloys dispersions (including cermets), ceramic products and mixtures containing uranium enriched in U235, plutonium or compounds of these products 2844.30 Depleted in U235, thorium, their compounds, alloys, dispersions (including cermets), ceramic products and mixtures containing uranium depleted in U235, thorium; compounds of these products 2844.41 Tritium and its compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing tritium or its compounds 2844.42 Actinium-225, 227, californium-253, curium-240, 241, 242, 243, 244, einsteinium-253, 254, gadolinium-148, polonium-208, 209, 210, radium-223, uranium-230 or 232, compounds; alloys, dispersions, ceramic products and mixtures 2844.43 Other alloys, dispersions (including cermets), ceramic products and mixtures containing these elements, isotopes or compounds 2844.44 Radioactive residues 2844.50 Spent (irradiated) fuel elements (cartridges) of nuclear reactors
For Indian shipping bills you need 8 digits. These six-digit codes are the international HS 2022. India's ITC(HS) classification (DGFT) and Customs Tariff (CBIC) add two more digits for the national tariff line, so pick the 8-digit line under your 6-digit code there, and confirm with your customs broker for anything borderline.