Preliminary energy-filtering neutron imaging with time-of-flight method on PKUNIFTY: A compact accelerator based neutron imaging facility at Peking University

被引：2
作者：
Wang, Hu
Zou, Yubin [1 ]
Wen, Weiwei
Lu, Yuanrong
Guo, Zhiyu
机构：
[1] Peking Univ, State Key Lab Nucl Phys & Technol, 201 Chengfu Rd, Beijing 100871, Peoples R China
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2016年 / 823卷
基金：
中国国家自然科学基金;
关键词：
Accelerator; Energy-filtering; Neutron imaging; Time-of-flight method; RADIOGRAPHY; GEANT4; MCNPX;
D O I：
10.1016/j.nima.2016.03.082
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Peking University Neutron Imaging Facility (PKUNIFTY) works on an accelerator based neutron source with a repetition period of 10 ms and pulse duration of 0.4 ms, which has a rather low Cd ratio. To improve the effective Cd ratio and thus improve the detection capability of the facility, energy-filtering neutron imaging was realized with the intensified CCD camera and time-of-flight (TOF) method. Time structure of the pulsed neutron source was firstly simulated with Geant4, and the simulation result was evaluated with experiment. Both simulation and experiment results indicated that fast neutrons and epithermal neutrons were concentrated in the first 0.8 ms of each pulse period; meanwhile in the period of 0.8-2.0 ms only thermal neutrons existed. Based on this result, neutron images with and without energy filtering were acquired respectively, and it showed that detection capability of PKUNIFTY was improved with setting the exposure interval as 0.8-2.0 ms, especially for materials with strong moderating capability. (C) 2016 Elsevier B.V. All rights reserved.
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收藏
页码：65 / 71
页数：7
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