Nuclear (Beijing) Nuclear Instrument Factory (formerly state-owned 261 Factory), founded in 1957, is a subsidiary of China National Nuclear Corporation's research, production in one state-owned enterprises, is the largest nuclear detector development base, is the earliest in the production of nuclear instrumentation manufacturers.

Currently, nuclear (Beijing) Nuclear Instrument Factory has begun industrial-scale nuclear instrumentation, has Yizhuang (Headquarters), Shunyi two research and development base, with three joint stock company (Beijing Orient control system in nuclear engineering company, Beijing dual-core Xinghua Medical Engineering Co., Ltd., Beijing nuclear Shun Lunda Industrial Company), a joint venture (Beijing in the photodetector Co., Ltd.), a Sino-Japanese joint venture ( Beijing Hamamatsu Photonics Co., Ltd.).

nuclear (Beijing) Nuclear Instrument Factory has worked at home and abroad in more than 30 types of reactors, reactor, power reactor , nuclear submarines, nuclear power provides a heap, the heap outside the nuclear detectors, control, protection, instrumentation and radiation protection, dose monitoring equipment. Also for the "Shenzhou" series of spacecraft, space satellites, the Navy submarine, the Second Artillery and the national health and epidemic prevention departments, environmental monitoring departments, tertiary institutions provide a number of special equipment. Two bombs and one boat for China, nuclear power and nuclear technology industry has made important contributions to the building, and in these areas to maintain the leading domestic level.

currently facing the development of national nuclear technology industry favorable situation, the nuclear (Beijing) Nuclear Instrument Factory will accelerate the pace of reform and innovation, strengthen cooperation and achieve nuclear military and national , nuclear power, nuclear science and technology industry and other industries developed simultaneously, providing customers with comprehensive solutions for measurement of nuclear radiation, as "China's nuclear testing experts", as "China's nuclear industry efforts to achieve sound and rapid and safe development of the ambitious goal" to contribute!