Acta Photonica Sinica, Volume. 43, Issue 12, 1204003(2014)
High Dectection Efficiency Low Noise Large Format Neutron Sensitive Microchannel Plate
Both direct addition of neutron-absorbing atoms into Microchannel Plate (MCP) glass and elimination of content contained natural radioactive isotope can make MCP sensitive to neutrons without changing the remainder of the fabrication process,while such a neutron-sensitive detector has very low background rate. The 50 mm format and 10 μm pore size MCP which fabricated by a MCP glass doped with 3 mol% Gd2O3 and eliminate K2O and Rb2O contnent demonstrated its capability to image thermal neutrons with 33% detection efficiency and low dark count rate of 0.11 events cm-2·s-1. Through calculation and analysis of the capture probability of neutron within a MCP matrix and the effective signal which arised from 155,157Gd(n, γ)156,158Gd reaction production,our study indicated that the maximum detection efficiency of 50% can be achieved for this MCP doped with 3 mol% Gd2O3 and optimized geometry. In addition,a 106 mm-diameter and 10 μm pore size neutron sensitive MCP doped with 3 mol% Gd2O3 and optimized geometry were fabricated based on above-mentioned method.
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PAN Jing-sheng, SUN Jian-ning, HAN Xiao-ming, ZHANG Rong, SUN Sai-ling, YANG Yi-gang, TIAN Yang, JIN Ge, ZHANG Zheng-jun, SHAO Ai-fei, SU De-tan. High Dectection Efficiency Low Noise Large Format Neutron Sensitive Microchannel Plate[J]. Acta Photonica Sinica, 2014, 43(12): 1204003
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Received: Mar. 7, 2014
Accepted: --
Published Online: Dec. 26, 2014
The Author Email: Jing-sheng PAN (jspan130@sina.com)