Cui, CW (reprint author), Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China.
We described the design of the measuring system for soft X-ray absolute intensity in detail. The system consists of two parts: the ionization chamber and the monitoring (or, to be calibrated) detector and its transfering system. The system can be used as the primary standard detector for the measurement of soft X-ray absolute radiation flux in the energy range from 50 to 2000 eV after calibrated. The uncertainty of the system is also given.