A fission neutron detector based on helium scintillator

作者：Zhang Xiao Dong; Qiu Meng Tong; Zhang Jian Fu; Ouyang Xiao Ping; Zhang Xian Peng; Chen Liang

来源：Acta Physica Sinica, 2012, 61(23): 232502.

DOI：10.7498/aps.61.232502

• neutron detector
• He-4 scintillator
• fission fragments
• sensitivity

A new neutron detector is designed. Two (UO2)-U-235 target foils are used as radiators, and the He-4 gas is used as scintillator in the detector. The detector combines the features of U-235 and He-4 fully, so it has some excellent performances, such as flat energy response to neutrons, better n/gamma discrimination, etc. It can be used well to detect neutrons in a pulsed mixture radiation field. In this paper, the principle and structure of the detector are introduced. The energy depositions of different energies of neutrons and gamma-rays in He-4 gas are calculated. The neutron sensitivity, gamma ray sensitivity, n/gamma discrimination, and time response of the detector are investigated theoretically and experimentally. The neutron sensitivity is about 10(-15) C.cm(2), gamma ray sensitivity is about 10(-17) C.cm(2), and time response is about 33.1 ns.

• 出版日期2012
• 单位西北核技术研究所