一种密封的陶瓷GEM基中子探测器
A sealed ceramic GEM-based neutron detector
摘要：
基于GEM的中子探测器在过去十年中蓬勃发展。然而，大多数GEM中子探测器都工作在流动气体模式下，由于大气压力和环境温度的动态变化，探测器的长期性能可能不稳定。本文介绍了中国空间中子源研制的灵敏面积为100 mm × 100 mm的密封陶瓷GEM中子探测器的性能，包括平台曲线、中子束流剖面、中子波长谱、空间分辨率等（FWHM：2.77 mm）、二维（2D）成像能力、中子探测效率和计数率不稳定性（相对标准偏差（RSD）：0.7%）。结果表明，该探测器在密封模式下具有良好的性能，可用于CSNS直接中子束流的测量。
英文摘要：
The GEM-based neutron detector has flourished in the past decade. However almost all the GEM-based neutron detectors work in the flow-gas mode, and the long-term performances of the detectors may be unstable due to the dynamic changes of atmospheric pressure and ambient temperature. In this paper, a sealed ceramic GEM-based neutron detector was developed at China Spallation Neutron Source (CSNS) and its sensitive area was 100 mm * 100 mm. The characterizations of the detector were presented and discussed, which included the plateau curve, the neutron beam profile, the neutron wavelength spectrum, the spatial resolution (FWHM: 2.77 mm), the two-dimensional (2D) imaging ability, the neutron detection efficiency and the counting rate instability (Relative Standard Deviation (RSD): 0.7%). The results show that the detector has good performances in sealed mode, and it can be used for the measurement of the direct neutron beam at CSNS.
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