MAGNETRON, MAGNETRON CATHODE BODY MANUFACTURING METHOD, AND CATHODE BODY

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It is possible to obtain a cathode body which can maintain a long service life even when a large current has flown.  Provided is a magnetron cathode body including as a base material, a metal of a high melting point having an electron emission material inside and coated by borax of rare earth.  The electron emission material and the metal of a high melting point are preferably La2O3 and W, respectively.  The borax of rare earth is preferably LaB6.