Comparison Between Experiment and Simulation for the Fission Chamber Used in Fast Neutron Detection

GUAN Yuanfan; YANG Herun; DUAN Limin; ZHANG Junwei; YUAN Xiaohua; HE Zhiyong; ZHANG Xueying; HU Rongjiang; LU Chengui; MA Peng; WEI Xianglun; LI Meng; GAN Zaiguo; YANG Chunli; ZHANG Hongbin; CHEN Liang

doi:10.11804/NuclPhysRev.36.04.471

A fission chamber coated with two layers of ²³⁸U fissile materials has been developed for the measurements of fast neutrons. The developed fission chamber can operate in the pulse mode, the mean square voltage mode, and the current mode to perform the flux measurement over a large dynamic range. The pulse mode of the fission chamber has been tested with a ²⁵²Cf neutron source by measuring the detection efficiency. To evaluate both the mean square voltage mode and the current mode, the pulse amplitudes from the fission chamber in different gas pressures have been measured with the ²⁵²Cf source. Then, the pulse amplitudes from the fission chamber have also simulated with the Geant4 Monte Carlo software tool. The simulation can explain measured results, detection efficiency is highest[(4.30±0.7)×10^-7] when gas pressure is 2.64×10⁵ Pa and energy spectrum of fission fragments is clearly, so the fission chamber can work in different modes.

Comparison Between Experiment and Simulation for the Fission Chamber Used in Fast Neutron Detection

1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China;

3. North China University of Water Resources and Electric Power, Zhengzhou 450000, China

Funds: National Natural Science Foundation of China (U1432123, 11575268, 11875301, 11675238)

Received Date: 2019-04-19

Rev Recd Date: 2019-06-18

Publish Date: 2019-12-20

Key words:

Abstract: A fission chamber coated with two layers of ²³⁸U fissile materials has been developed for the measurements of fast neutrons. The developed fission chamber can operate in the pulse mode, the mean square voltage mode, and the current mode to perform the flux measurement over a large dynamic range. The pulse mode of the fission chamber has been tested with a ²⁵²Cf neutron source by measuring the detection efficiency. To evaluate both the mean square voltage mode and the current mode, the pulse amplitudes from the fission chamber in different gas pressures have been measured with the ²⁵²Cf source. Then, the pulse amplitudes from the fission chamber have also simulated with the Geant4 Monte Carlo software tool. The simulation can explain measured results, detection efficiency is highest[(4.30±0.7)×10^-7] when gas pressure is 2.64×10⁵ Pa and energy spectrum of fission fragments is clearly, so the fission chamber can work in different modes.

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Reference (18)

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Comparison Between Experiment and Simulation for the Fission Chamber Used in Fast Neutron Detection

doi: 10.11804/NuclPhysRev.36.04.471

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