2844.42.00.00 - Actinium-225, actinium-227, californium-253, curium-240, curium-241, curium-242, curium-243, curium-244, einsteinium-253, einsteinium-254, gadolinium-148, polonium-208, polonium-209, polonium-210, radium-223, uranium-230 or uranium-232, and their compounds; alloys, dispersions (including cermets), ceramic products and mixtures containing these elements or compounds

This HTS classification, 2844.42.00.00, specifically enumerates certain radioactive elements and isotopes, along with their compounds, alloys, dispersions, ceramic products, mixtures, and residues containing them. The listed elements include actinium-225 and -227, californium-253, various curium isotopes (240 through 244), einsteinium-253 and -254, gadolinium-148, polonium-208 through -210, radium-223, and uranium-230 or -232. This detailed listing ensures precise classification of these specific high-value or specialized radioactive materials.

Unlike sibling categories such as 2844.41.00.00, which is dedicated to tritium and its compounds, or 2844.43.00 covering "other" radioactive elements and isotopes not otherwise specified, this subheading carves out a distinct group of well-defined radioactive substances and their related products. Furthermore, it differs from 2844.44.00.00, which exclusively covers radioactive residues, by focusing on active radioactive elements and their incorporated forms.

As this is a leaf node within the HTS structure, there are no further subdivisions. Therefore, the classification of goods under 2844.42.00.00 relies entirely on the precise identification of the aforementioned radioactive elements or their compounds, alloys, dispersions, ceramic products, mixtures, or residues. Proper identification and documentation of the specific radioactive isotope or element present are crucial for accurate classification.