Within the types category, the market is differentiated by the form and preparation of Thallium-201 supplied to end users. The primary type is the radiopharmaceutical kit, which constitutes about 70% of volume; kits are pre‑measured, sterile vials designed for immediate reconstitution, ensuring dose accuracy and compliance with GMP standards. A secondary type, custom formulations, accounts for roughly 20% and serves specialized clinical trials or institutions requiring tailored activity levels or carrier‑free formulations. The remaining 10% is captured by research‑grade material, sold to academic and industrial laboratories for assay development, radiochemistry studies, and pre‑clinical imaging. Sub‑categories such as high‑specific‑activity versus low‑specific‑activity variants influence pricing and adoption rates, with high‑specific‑activity preferred for low‑dose protocols that minimize patient radiation exposure. These type distinctions collectively shape the market’s supply chain dynamics and contribute to the overall valuation of the Thallium-201 market.