Neutron radiography and tomography : determining and optimizing resolution of neutron sensitive multi channel plate detectors
Neutron radiography and tomography : determining and optimizing resolution of neutron sensitive multi channel plate detectors
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中子射线照相和断层扫描：确定和优化中子敏感多通道板探测器的分辨率
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发表时间：
2013
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通讯作者：
W. Williams
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作者：
W. Williams
批准人：_ Steven R.这项工作的目的是确定和优化的中子敏感的多通道板（MCP）探测器的分辨率，以确定其在射线照相和层析成像的能力。为了分析这些能力，俄勒冈州州立大学的中子射线照相设施在2012年增加了一个MCP探测器。二维和三维成像的主要因素是探测器的空间分辨率。由Nova Scientific Inc.使用MCP的体壁内的10B（n，α）Li7反应，以便将中子转换为α和锂粒子，其具有引发产生输出脉冲的电子雪崩的高概率。该反应控制空间分辨率。探测器的结构允许理论上的最大空间分辨率为17 μm。通过微调电子器件并使用热中子束，可以在整个有源探测器区域记录计数率，其中可以使用较低的计数率来识别对象内的中子吸收或衰减区域。这些差异用于创建射线照片，该照片提供有关材料衰减系数和被成像物体几何形状的信息。对于本研究，对象包括分辨率掩模、美国材料与试验协会（ASTM）标准以及沿着各种其他材料。由于射线照片是近实时数字创建的，因此探测器具有中子断层摄影的能力，射线照片的分辨率约为理论极限。版权所有：Walter James威廉姆斯
Approved:___________________________________________________ Steven R. Reese The objective of this work was to determine and optimize the resolution of a neutron sensitive Multi-Channel Plate (MCP) detector in order to determine its capabilities in radiography and tomography. The Oregon State University, Neutron Radiography Facility added an MCP Detector in 2012 in order to analyze these capabilities. The leading factor in the generation of both twodimensional and three-dimensional imaging was the spatial resolution of the detector. The MCP detector developed by Nova Scientific Inc. uses the 10B(n,α)Li7 reaction within the MCP’s bulk walls in order to convert the neutron into an α and lithium particle which have a high probability of initiating an electron avalanche that generates an output pulse. This reaction governs the spatial resolution. The detector's mechanics allow for a theoretical maximum spatial resolution of 17 μm. By fine tuning the electronics and using a thermal neutron beam, count rates can be recorded throughout the active detector area, where lower count rates can be used to identify areas of neutron absorption or attenuation within the object. These differences are used to create a radiograph which gives information on the material's attenuation coefficient and geometry of the object being imaged. For this study, the objects include resolution masks, American Society for Testing and Materials (ASTM) Standards, along with a variety of other materials. Since the radiograph is digitally created in near real-time, the detector has the capability of neutron tomography with the radiograph's resolution being on the order of the theoretical limit. © Copyright by Walter James Williams