基于超顺排碳纳米管技术的冷阴极X射线管研制  

Development of a cold cathode X-ray tube based on the Super-aligned arrays of carbon nanotubes

作　　者：唐利华 张国光[1] 周段亮 柳鹏[2] 姜开利[2] TANG Lihua;ZHANG Guoguang;ZHOU Duanliang;LIU Peng;JIANG Kaili(China Institute of Atomic Energy,Beijing 102413,China;Tsinghua-Foxconn Nanotechnology Research Center,Department of Physics of Tsinghua University,Beijing 100084,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]清华大学物理系清华-富士康纳米科技研究中心,北京100084

出　　处：《核技术》2020年第4期70-75,共6页Nuclear Techniques

基　　金：国家自然科学基金(No.51788104、No.51727805、No.51672152);国家重点研发计划(No.2018YFA0208401、No.2017YFA0205800)资助。

摘　　要：冷阴极X射线管是静态CT系统的关键部件。自从超顺排碳纳米管阵列被发现后,其被用于X射线管中的研究就逐渐展开。通过设计一款新的X射线管结构并采用一套新的X射线管制备工艺开展了冷阴极X射线管研制工作。采用乙炔为碳源气,用化学气相沉积法,制备出超顺排碳纳米管阵列;然后将其作为电子源,研制了一种基于超顺排碳纳米管技术的冷阴极X射线管,并对其进行了性能测试。从绘制的I-V特性曲线分析,当栅极电压为2 373 V时,得到最大发射电流为5.0 mA;使用小孔成像法测得的X射线焦点尺寸为0.6 mm×1.6mm。在阳极高压130 k V以下,研制的X射线管工作稳定。本研究为研制脉冲X射线源以及静态CT安检系统奠定了基础。[Background]The cold cathode X-ray tube is a key component of static CT system.Since the discovery of super-aligned arrays of carbon nanotubes,their applications in X-ray tubes have been gradually developed.[Purpose]This study aims to design and implement a cold cathode X-ray tube based on super-aligned arrays of carbon nanotubes.[Methods]The cold cathode X-ray tube was developed by designing a new X-ray tube structure and adopting a new X-ray tube preparation process.The acetylene was taken as carbon source gas,the super-aligned arrays of carbon nanotubes were prepared by using the chemical vapor deposition method.Then the cold cathode Xray tube based on the technology of super aligned carbon nanotubes was developed by taking the nanotubes as electron source,and the performance of the developed X-ray tube was tested.Both the I-V characteristic curve and the X-ray focus size were obtained.[Results]Results shown on the I-V characteristic curve indicates the maximum emission current of this developed cold cathode X-ray tube is 5.0 mA when the gate voltage is 2373 V.The focus size determined by the pinhole imaging is 0.6 mm×1.6 mm.When the anode high voltage is below 130 kV,the X-ray tube works stably.[Conclusions]This study lays a foundation for the development of pulsed X-ray source and static CT security system.

关 键 词：X射线管 冷阴极 超顺排阵列 碳纳米管 

分 类 号：TL99[核科学技术—核技术及应用]