2844.43.00.28 - Other

This HTS category, 2844.43.00.28, encompasses "Other" radioactive chemical elements, isotopes, and their compounds, as well as mixtures and residues containing them, which are not specifically listed under other subheadings. It covers a broad range of radioactive materials that fall outside the more precisely defined categories within Chapter 28. This includes, but is not limited to, radioactive substances used in research, industrial applications, or medical diagnostics that do not fit into the more common or standardized radioactive materials.

The key distinction of this subheading lies in its residual nature. While sibling categories like 2844.43.00.21 enumerate specific isotopes such as Americium-241, Californium-252, and Cesium-137, this "Other" category is for all other radioactive elements, isotopes, compounds, and mixtures not otherwise specified. This ensures that all radioactive materials not explicitly detailed elsewhere in the tariff schedule are accounted for, preventing classification gaps.

As this is a leaf node, there are no further subcategories. Therefore, classification under 2844.43.00.28 hinges on a thorough review of the specific radioactive material's isotopic composition, chemical form, and intended use, confirming that it does not meet the criteria for any other preceding subheading within the 2844 series. Practical classification will often involve examining certificates of analysis, technical specifications, and Safety Data Sheets (SDS) to confirm the absence of a more specific classification.