CATHODE BODY, FLUORESCENT TUBE, AND METHOD FOR MANUFACTURING CATHODE BODY

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Provided is a cathode body that has : a cylindrical cup (30) as a base body; a barrier layer (303), which is provided on the surface of the cylindrical cup (30), and contains SiC; and a film, which is formed on the surface of the barrier layer (303), and contains a boride of a rare-earth element. The cathode body eliminates interdiffusion of the component elements of the base body and the boride.