X-Ray Tube with a Built-In Secondary Target for Exciting K Lines

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Abstract
A special continuously pumped x‐ray tube has been developed for producing high intensities of characteristic K‐emission lines. The rotating primary target consists of a gold‐plated copper cylinder, which is water‐cooled. The conical secondary target is placed inside the primary target and close to it so as to achieve a high output yield. With the tube windows used at present, wavelengths between 0.1 and 0.5 Å can be produced by choosing the appropriate elements for the secondary target. To obtain a high purity of the radiation, the tube voltage should be less than three times the minimum excitation potential for the K radiation in question. The x‐ray yield is 108−109 quanta/mA‐sec‐sr.