【摘要】 为了测量特定实验条件下狭小空间内中子注量率分布,研制了小型平板浓缩铀裂变电离室,该裂变室具有体积小、结构材料少等优点。论文叙述了裂变电离室的结构和制作工艺,通过测量自发衰变α粒子谱、裂变碎片谱对裂变电离室的性能进行了测试和评定,并标定了裂变电离室测量裂变碎片的探测效率。从指标上看,裂变电离室能达到设计要求和目的,可用于中子注量率的测量。更多还原

【Abstract】 To accurately measure neutron flux at several positions of small space inside assemblies in integral neutron experiments,a micro plate fission chamber was designed and fabricated. Smaller volume and less structure material were taken into consideration in the development of the detector. In this paper,the structure of fission chamber and process of fabrication were introduced and performance were tested and evaluated by measuring alpha spectrum from self- decay and fission spectrum. The detection efficiency of the detector was calibrated and it is 91. 7%. The performance test results indicate that,the fission chamber has achieved the aimed parameter and goal,can be used in measurement of neutron flux.更多还原