摘要
报道了X射线阴极的光电发射原理,给出CsI/MCP X射线阴极的制作方法。分析了反射式和透射式X射线阴极的量子效率和噪声特点,提出了改进工艺,给出CsI/MCP的输出特性和扫描电镜正面和剖面照片,且指出L ixiscope的发展以及在生物医学中的应用前景。
Lixiscope is made up of X-ray source, X-ray image intensifier and high voltage power supply. Among them the X-ray cathode is the key in technology of image tube. Soft X-ray usually means that waveband is between in 0. 012 nm and 0. 062 nm （tube voltage at 20 - 100 kV）. Corresponding X-ray cathode have two types ：transmission and reflection type, which is used to realize the conversion function that X-ray transferred to photoelectrons. And at present X-ray cathode in X-ray image intensifier that applied in our country with Microchannel plates （MCP） is mostly CsI/MCP structure. One of them is with dense structure or denseloose-densestructure （ loose layer is very thin）, but the end surface of MCP is pervious, it works in the form of reflection type. Another one is dense-loose-dense structure （loose layer is very thick）, but most of the end surface channel of MCP is stop up, it relies mainly on transmission type working way and complementally on reflecting type working way. Exploring its making technology, studying its quantum detection efficiency, analyzing its noise characteristic, improving the characteristic of image tube and system are the top priority tasks, especially there are practical meanings today that Lixiscope （Lixiscope-Low Intensity X-ray Imaging Scope） is developed fast and its use is widened even more in biomedicine. In this paper, the operation principle picture, the outputs characteristic curve and corresponding technical data of X-ray cathode is provided. The front and sectional stereo-scan photographs of CsI/MCP reflecting type X-ray cathode is provided, and available information has been offered.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2005年第6期813-818,共6页
Chinese Journal of Luminescence
基金
吉林省科委项目(吉921039)
国家计经委(JZM97014)资助项目
