A novel method to measure low flux ambient thermal neutrons with 3He proportional counters

被引：9
|
作者：
Zeng, Z. M. [1 ,2 ]
Gong, H. [1 ,2 ]
Yue, Q. [1 ,2 ]
Li, J. M. [1 ,2 ]
机构：
[1] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Minist Educ, Key Lab Particle & Radiat Imaging, Beijing 100084, Peoples R China
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2017年 / 866卷
基金：
中国国家自然科学基金;
关键词：
Double-pulse effect; PSD; Underground laboratory; Low background neutron; He-3 proportional tube;
D O I：
10.1016/j.nima.2017.04.009
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
A pulse shape discrimination method to discriminate neutron events from backgrounds based on the double-pulse effect of He-3 proportional counters is proposed and detailed in this paper. We made an ambient thermal neutron measurement system composed of a commercial He-3 proportional counter tube and the corresponding readout electronics. The background of the system has been measured and the minimum detectable amount of the He-3 proportional counter tube will be reduced by an order of magnitude with this method. The system was applied to measure the ambient thermal neutron flux inside a large neutron shielding structure at a deep underground laboratory and the pulse shape discrimination method proves to be effective. (C) 2017 Elsevier B.V. All rights reserved.
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页码：242 / 247
页数：6
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