基于GEANT4的工业CT微通道板探测器特性模拟
The Characteristics Simulation of Industrial CT Microchannel Plate Detector Based on GEANT4 Toolkits
摘 要
基于GEANT4工具包及使用225kV最高管电压X射线机，探讨了在不同的X射线入射能量下，改变微通道板工作电压及几何参数时，增益、探测效率及空间分辨率的特性变化情况，为实际应用提供了参考。结果表明：微孔直径20μm、长径比40、开口面积60%、偏角8°；工作电压970V，工作环境真空度10-3Pa时，微通道板探测器能满足工业CT系统的要求。
工业CT
GEANT4
探测器
Micro channel plate
Industrail CT
GEANT4
Detector
Abstract
Based on the GEANT4 toolkit and an X ray machine whose maximum tube voltage was 225kV, the characteristic changes of the gain, the detection efficiency and also the spatial resolution of the Xray detector were studied through the working voltage and geometric parameters of the microchannel plate under different incident energies. It can provide a reference for practical application. Study confirms that the microchannel plate detector can meet the requirement of industrial CT system proving the following settings are met: the micro pore diameter of 20μm, length to diameter ratio of 40, the opening area of 60%, angle of 8°, working voltage of 970V and the working environment of vacuum degree 10-3Pa.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 兰州大学自然科学类中央高校基本科研专项资助项目(860452)
收稿日期 2013/11/1
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备注张催(1990-)，男，硕士研究生，主要从事工业CT和粒子探测方面的工作。
引用该论文: ZHANG Cui,LI Gongping,PAN Xiaodong,WANG Dong,CHAI Jiabin. The Characteristics Simulation of Industrial CT Microchannel Plate Detector Based on GEANT4 Toolkits[J]. Nondestructive Testing, 2014, 36(8): 1～6
张催,李公平,潘小东,王东,柴佳彬. 基于GEANT4的工业CT微通道板探测器特性模拟[J]. 无损检测, 2014, 36(8): 1～6
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参考文献
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【3】叶云长.计算机层析成像检测［M］.北京：机械工业出版社,2006：51-52.
【4】KUMAR U,RAMAKRISHNA G S,PENDHARKAR A S,et al. Behaviour of reconstructed attenuation values with Xray tubevoltage in an experimental thirdgeneration industrial CT system using X scan linear detector array[J]. Nuclear Instruments and Methods in Physics Research A,2002,490：379-391.
【5】赵世诚,于长海,王黎君.微通道板X射线探测器[J].核聚变与等离子体物理,1985,5(3)：63-64.
【6】SANG C L.A flatpanel detector based microCT system：performance evaluation for smallanimal imaging[J]. Phys.Med.Biol.2003,48(24)：4173-4185.
【7】潘京生.微通道板及其主要特征性能[J].应用光学,2004,25(5)：25-29.
【8】SHILHALIEV P M, DUCOTE J L, XU T, et al. Quantum efficiency of the MCP detector：monte carlo calculation[J]. IEEE Transactions on Nuclear Science, 2005,52(5)：1257-1258.
【9】GOULD R G, JUDY P F, KLOPPING J C, et al. Quantumdetection efficiency of a microchannel plate image intensifier[J]. Nucl. Instr. Methods,1977,144(3)：493-500.
【10】WOODHEAD A W, ESCHARD G. Microchannel plates and their applications[J]. Acta Electronics,1971(14)：181-182.
【11】DILMANIAN F A.A highresolution spect system based on a microchannelplateimage[J].IEEE Transactions on Nuclear Science,1990,37(2)：687-695.
【12】ALLISON J, AMAKO K, APOSTOLAKIS J, et al. Geant4 Developments and Applications[J]. IEEE Transactions on Nuclear Science, 2006,53(1)：270-278.
【13】苏吉,王化祥,薛倩,等.基于Geant4的γCT系统优化设计[J].核技术，2011,34(8)：575-576.
【14】WIZA J L.Microchannel plate detectors[J]. Nuclear Instruments and Methods,1979(162)：587-601.
【15】张多明.微通道板[J].物理,1986(9)：545-547.
【16】TANAKA Y T,YOSHIKAWA I, YOSHIOKA K, et al. Gammaray detection efficiency of the microchannel plate[J].Rev.Sci.Instrum,2007,78(3)：4501-4505.
【17】杨福家.原子物理学［M］.北京：高等教育出版社,2008：291-295.
【18】汪贵华.光电子器件［M］.北京：国防工业出版社,2009：99-104.
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