Abstract
Efficiency of a tungsten-target Coolidge x-ray tube operated at peak voltages from 100 to 200 kv.---The efficiency of x-ray production was experimentally determined for voltages between one and two hundred kilovolts. The high voltage energy input into the x-ray tube was measured by means of an absorption calorimeter. The intensity of the x-rays was measured by means of the temperature rise of a lead absorption cup arranged so that the effects due to scattering and fluorescence of the x-rays as well as effects due to external temperature conditions were eliminated. Elaborate precautions were also taken to suppress electrostatic and electromagnetic induced effects from the high voltage circuits. The efficiency was found to be proportional to the peak voltage. The factor of proportionality was 0.0032 when the efficiency is expressed in percent and the peak voltage in kilovolts.
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