| 284410 | 284410 - Uranium; natural uranium and its compounds, alloys, dispersio |
| 284420 | 284420 - Uranium; enriched in U235, plutonium, their compounds, alloys |
| 284430 | 284430 - Uranium; depleted in U235, thorium, their compounds, alloys, |
| 284440 | 284440 - Radioactive elements, isotopes, compounds, n.e.c. in heading |
| 284441 | 284441 - Radioactive elements; tritium and its compounds; alloys, disp |
| 284442 | 284442 - Radioactive elements; actinium-225, 227, californium-253, cur |
| 284443 | 284443 - Radioactive elements, isotopes and compounds; other alloys, d |
| 284444 | 284444 - Radioactive elements, isotopes, compounds n.e.c. in heading n |
| 284450 | 284450 - Spent (irradiated) fuel elements (cartridges) of nuclear reac |