Experience with a Water-cooled X-ray Tube for Deep Therapy

Last year W. D. Coolidge and C. N. Moore described a watercooled high voltage X-ray tube which satisfactorily handles as much as 50 milliamperes at 250,000 volts (1). The best high voltage tube on the market before that time could not be used continuously with more than 8 M.A. at 200,000 volts. Thus an X-ray intensity could be obtained with the new tube many times as great as was possible before. Earlier experience in our Institute made us believe that increased in tensity was desirable. Dr. Gaylord, therefore, wished to have a water-cooled tube installed and Dr. Coolidge and the Victor Corporation agreed to furnish the Institute with one of the first tubes of t,his type, with advice as to where to order necessary equipment for the installation. Even with this information, it was rather difficult to arrive at an arrangement which was suitable for treatment.