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介绍了BCF－12光纤的特性，着重描述了以BCF—12光纤为主体，用光电倍增管读出的束流诊断元件的结构、特性及其在兰州放射性离子次级束流装置RIBLL上的应用。
The characteristics of BCF-12 fiber are introduced. The structure, characteristics and application of beam diagnostic element read by photomultiplier tube with BCF-12 fiber as the main body are described. The application of this technology in RIBLL of Lanzhou radioactive ion secondary beam-flow device .