| 摘要 |
PURPOSE: A long-life electron tube device, an electron tube cathode, and a manufacturing method for the electron tube device are provided to achieve stable emission characteristics over a long period of time. CONSTITUTION: An electron tube device comprises an electron gun that includes a cathode(20) that emits electrons. The cathode includes a base metal whose main component is nickel and that includes magnesium as a reducing agent, an emitter layer whose main component is barium oxide, and that includes a predetermined metal and/or metal oxide as a dopant, and a heater that heats the base metal and the emitter layer, wherein a ratio between a number of moles of the magnesium, a number of moles of barium, and a number of moles of the predetermined metal and/or metal oxide is expressed as Y:1000:X, and when a value of Y and a value of X are expressed as XY coordinates in which the X coordinate is the value of X and the Y coordinate is the value of Y, the value of X and the value of Y are within a range defined by straight lines connecting points (0.7,6), (0.8,15), (3,130), (3,30), (2.5,10), (2,0.1), and (1,0.1).
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