小型平板铀裂变电离室研制

Micro Plate Fission Chamber Development

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。

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 struc-ture 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 meas -uring alpha spectrum from self -decay and fission spectrum .The detection efficiency of the detector was cali-brated 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 .