Especially within the last three years the interest of the profession in this country has been aroused by claims advanced for the value of the "new deep roentgenotherapy," a method of radiation involving the use of rays of much shorter wave length than have heretofore been available for purposes of treatment. For a decade such physicists as Duane, Dessauer and Coolidge have been seeking means for producing roentgen rays of wave length nearly approximating the shorter gamma rays of radium. Refinements have been reached in the construction of roentgen-ray apparatus, permitting the maintenance of constant very high voltages (from 200,000 to 280,000) delivered at the roentgen-ray tube terminals. Dr. Coolidge has continued the development of his tube until we now have a type of roentgen-ray tube, capable of withstanding more than 200,000 volts at 8 milliamperes in continuous use. The physical and biologic investigations carried on simultaneously in Europe and
CASE JT. THE NEW SHORT WAVE LENGTH ROENTGEN-RAY THERAPY. JAMA. 1922;79(9):699–704. doi:10.1001/jama.1922.02640090007002
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