; Gong Guang-Hua
; Hou Lei
; Shao Bei-Bei] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
; [Li Jin] CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
; [Li Yu-Xiong] Univ Sci & Technol China, NSRL, Hefei 230029, Peoples R China
To monitor the integral dose deposited in the BESIII electromagnetic calorimeter whose performance degrades due to exposure to the BEPC II background, a 400 nm IMPL RadFET dosimeter-based integral dose online monitor system is built. After calibration with the (60)Co source and verification with TLD in the pulse radiation fields, an experiment was arranged to measure the BEPC II background online. The results are presented.