Simulation Research on the New Electrode Structure of Ionization Chamber Detector

Abstract

Abstract The gas ionization chamber can be used in the examination of the irradiated fuel assembly and online measurement of steel sheet thickness. Response time is an important parameter of gas ionization chamber detectors, which will affect the clarity of radiation imaging. Previous results show that in the ionization chamber of the traditional structure, the electric field intensity is relatively low in some areas, which will affect the response time of the gas detector. By modifying the structure of the electrode, the areas of the weak electric field can be reduced or even eliminated. In this paper, we propose a new electrode structure, and two software tools are used in this work. Solidworks is used to establish ionization chamber models with different electrode structures. The finite element analysis software Simcenter MagNet is adopted to obtain the electric field distribution. The results show that the area of the weak electric field inside the ionization chamber of the new electrode structure is significantly reduced. In addition, the average electric field strength inside the gas ionization chamber detector with the new electrode structure is also improved. Theoretical calculation results show that the drift time of ions is reduced by about 0.690ms. Therefore, the development of the new electrode structure can effectively reduce the response time of the detector.