Realization and evaluation of doping and coating neutron sensitive MCP
Realization and evaluation of doping and coating neutron sensitive MCP
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DOI：
10.1016/j.phpro.2012.03.039
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
N. Lu;Yigang Yang;J. Lv;J. Pan;Xiaoming Han;W. Xu;Manchun Liang;Xuewu Wang;Yuanjing Li
中科院分区：
文献类型：
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作者：
N. Lu;Yigang Yang;J. Lv;J. Pan;Xiaoming Han;W. Xu;Manchun Liang;Xuewu Wang;Yuanjing Li
高探测效率、高空间分辨率是清华大学紧凑型脉冲强子源(CPHS)中子探测的良好特性。微通道板结构致密(孔径13.5μm，螺距16.25μm)有利于实现良好的分辨率。然而，MCP玻璃本身并不对中子敏感，因此应该人工引入中子吸收核素。本文在微孔内表面分别掺入10%Na B_2O_3和∼40 nm厚的Na_Gd_2O_3涂层，实现了热中子敏感型MCP。掺杂直接改变了MCP玻璃的成分，镀膜采用原子层沉积(ALD)技术。用中国原子能所轻水反应堆提供的热中子束进行的准直实验证实了这两个MCP的中子灵敏度。实现了热中子敏感MCP，显示出在高探测效率和空间分辨率热中子成像中的应用潜力。
High detection efficiency, good spatial resolution are both favorable properties in neutron detection of CPHS (Compact Pulsed Hadron Source) in Tsinghua University. Compact geometry (pore diameter of 13.5 μm and pitch of 16.25 μm) of micro-channel plate (MCP) may be beneficial for excellent resolution realization. However, MCP glass is not intrinsically neutron sensitive so neutron absorption nuclides should be introduced artificially. In this paper, thermal neutron sensitive MCPs are realized with 10mole% natB2O3 doping and ∼40 nm thick natGd2O3 coating layer on the inner surface of MCP pores respectively. Doping directly changes the component of MCP glass and coating is realized with atomic layer deposition (ALD) technique. Collimation experiments conducted with thermal neutron beam provided by a light water reactor of China Institute of Atomic Energy (CIAE) confirmed the neutron sensitivity of these two MCPs. Thermal neutron sensitive MCPs are realized and show potential to be used in high detection efficiency and spatial resolution thermal neutron imaging.