Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (12): 120402-120402.doi: 10.11889/j.0253-3219.2016.hjs.39.120402


Influence of parameters of micro fission chamber operated in current mode upon the detection performance

MENG Lingjie, LAI Wei   

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China
  • Received:2016-07-26 Revised:2016-11-02 Online:2016-12-10 Published:2016-12-10
  • Supported by:

    Supported by Strategic Pilot Science and Technology of China Academy of Sciences (No.XD02001003)


Background: When a fission chamber is operating for neutron detection, the ionization and recombination processes occur continually in its inner gas. Its detection performance correlates with these processes. Purpose: This study aims to further understand the influence of these processes and parameters of micro fission chamber on the detection performance from the aspect of plasma physics. Methods: BOLSIG+ software and basic theory model of fission micro chamber are applied for the simulation of the detection performance in current mode. The voltage range of saturation zone is taken as function of parameters such as geometry dimension of the electrode size, fissile rate and gas ionization degree. Results:The voltage range of saturation zone increases with the sensitive length, but decreases with fission rate and gas ionization degree. An optimal geometric electrode size exists for maximum voltage saturation zone. Conclusion: According to the computation results at different gas ionization degrees, one possible reason for the reduction of the voltage range of saturation zone at high temperature is explained.

Key words: Fission chamber, Current mode, Voltage range, Saturation zone

CLC Number: 

  • TL8