China Isotope & Radiation Corporation (CIRC), a holding subsidiary of China National Nuclear Corporation founded in 1983 and headquartered in Beijing, China, ranks as China's largest comprehensive nuclear enterprise focused on the research, development, manufacture, distribution, and service of radioisotope and radiation technology products; its core offerings encompass over 70 nuclides and 300 products across radioisotope preparation via nuclear reactors and cyclotrons, diagnostic and therapeutic radiopharmaceuticals including 99Mo-99mTc generators and 99mTc kits, radioactive sources, radiation engineering solutions such as nuclear reactors and cobalt-60 facilities, irradiation processing services for medical devices, food, and traditional Chinese medicines, in vivo therapy nuclides, radioimmunoassay kits, and [13C]/[14C]-urea breath test kits and instruments; operations span three radiopharmaceutical manufacturing and research bases in Beijing, Chengdu, and Shenzhen, with radiopharmacies in approximately 20 cities supporting a nationwide marketing and technical network, alongside exports of seven product categories to over 50 countries, primarily targeting healthcare, industrial, and research sectors in Asia and globally. CIRC maintains one of the world's widest ranges of isotope products and the most complete industrial chain in its field, positioning it as Asia's largest supplier of nuclear technology applications. In late November 2025, CIRC entered a strategic cooperation agreement with CNNC Capital Holdings Limited to collaborate on mergers and acquisitions, equity investments, and resource sharing for enhanced development in the nuclear sector; the company also received recognition for its ESG practices, winning the Outstanding China ESG Practice (2025) award and inclusion in the ESG Pioneers Index (Top 100) by Central China Securities.