China Isotope & Radiation Corporation （CIRC） is a holding subsidiary of China National Nuclear Corporation, and is also China's largest nuclear application enterprise integrating the R&D, production, sales and services of nuclear technology products. With 63 wholly owned or controlled subsidiaries and nearly 50 production lines, CIRC can provide more than 70 kinds of nuclides and over 300 types of products for various users. It is one of the enterprises with the largest number of isotopes and products, and the most complete industrial chain in the world. It is also the largest supplier of nuclear technology products and services in Asia.