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

Lingjie MENG; Wei LAI

doi:10.11889/j.0253-3219.2016.hjs.39.120402

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

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-24

- Influence of parameters of micro fission chamber operated in current mode upon the detection performance
- NUCLEAR TECHNIQUES Vol. 39, Issue 12, Article number: 120402(2016)
- 作者机构：
  
  中国科学院上海应用物理研究所嘉定园区上海 201800
- 作者简介：
- 基金信息：
  
  Strategic Pilot Science and Technology of China Academy of Sciences
- DOI：10.11889/j.0253-3219.2016.hjs.39.120402
  CLC： TL8
- Received：26 July 2016，
  
  Revised：02 November 2016，
  
  Published：2016-12
- 稿件说明：
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Lingjie MENG, Wei LAI. Influence of parameters of micro fission chamber operated in current mode upon the detection performance[J]. Nuclear techniques, 2016, 39(12): 120402
DOI：

Lingjie MENG, Wei LAI. Influence of parameters of micro fission chamber operated in current mode upon the detection performance[J]. Nuclear techniques, 2016, 39(12): 120402 DOI： 10.11889/j.0253-3219.2016.hjs.39.120402.

摘要

裂变电离室在工作时，其内部气体中持续地发生着电离和复合过程。为了进一步了解这些过程对探测性能的影响，需要从等离子体物理的角度来研究裂变电离室。借助BOLSIG+以及电流模式下微型裂变电离室的基本理论模型，计算了电极的几何尺寸、裂变率以及气体电离度等参数对探测器饱和区电压范围的影响，并对结果进行了讨论。此外，根据不同电离度情况下的计算结果，对高温导致探测器饱和区电压范围变小这一现象给出了一种可能的解释。

Abstract

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 extension of the saturated zone at high temperature is explained.

关键词

Keywords

references

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