Abstract

A fine focus X-ray tube of the new type was constructed. The electron gun has double wehnelt cylinders. The size of the X-ray source was measured by means of an X-ray pinhole camera. The size of the source becomes very small for the positive value of the bias voltage on the inner cylinder with which the image of the filament is formed on the anode. The finest X-ray source obtained is 40µ in half width and 400µ in length. The peak specific loading is about 8×10 5 W/cm 2 at the filament temperature 1,700°K which assures long life of the filament.

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