The Type segmentation of the Radioactive Waste Storage Tank market distinguishes four primary construction materials: concrete, carbon‑steel, composite (often carbon‑fiber reinforced polymer), and fiberglass‑reinforced plastic. Concrete tanks, characterized by high radiation shielding and long‑term durability, dominate the market due to their suitability for high‑activity waste and regulatory preference, accounting for roughly 40% of total installed capacity. Carbon‑steel tanks, offering cost‑effectiveness and ease of fabrication, serve medium‑activity streams and represent about 30% of the market, especially in legacy nuclear facilities. Composite tanks combine corrosion resistance with reduced weight, enabling modular deployment in remote or space‑constrained sites; they contribute approximately 20% of market volume. Fiberglass tanks, valued for chemical inertness and low maintenance, occupy the remaining 10%, primarily in research laboratories and small‑scale medical isotope plants. Together, these material categories define the market’s structural foundation and directly influence capital expenditure, lifecycle cost, and compliance considerations within the broader Radioactive Waste Storage Tank segmentation.