Within the Tungsten-188 market taxonomy, types are differentiated by isotopic enrichment level, chemical form, and target configuration. Enriched Tungsten‑188, produced via neutron capture on natural tungsten, commands a premium and represents the majority of supply for high‑precision medical and research uses, reflecting its higher specific activity. Conversely, natural‑waste material, recovered from reactor by‑products, supplies lower‑cost bulk for industrial radiography where activity tolerances are broader. Chemical forms—metallic foil, oxide powder, and compound solutions—affect handling, target durability, and irradiation efficiency; metallic foils are preferred for thin‑target production, while oxides enable higher loading densities. Target configurations, such as rotating versus static assemblies, further influence production yield and cost structure. Collectively, these type distinctions shape cost curves, supply chain logistics, and ultimately the market’s total addressable volume.