The Radioisotope (RI) Laboratory is located adjacent to the main building of the institute and covers 403 sq.m. It was founded in 1967, and was extended by branch laboratories with a combined space of about 600 sq. m. during the establishment of the North building in 1979 and of the Central Laboratory for Biological Hazardous Microbes in 1983. In 1998, a radiation exposure room was established on the first basement level of the South building. The Genome Information Research Center radioisotope laboratory joined in 2007. At present, the total radiation controlled area is about 1,700 square meters.
The RI Laboratory is designed for biomedical experiments with radioisotopes and plays an important role in the research institute. Its facilities include an RI stockroom, a distribution room, a tissue culture room, and an area for RI- measuring equipment. Safety requirements are met by a stringent security system that involves the use of ID cards and computerized management of radioisotopes. About 200 researchers use the RI laboratory every year.