The Efficiency of Radiographic Tubes

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Abstract
Inherent filtration of a series of x-ray tubes was found to vary from 04 to 0.8 mm Al equivalent. While this does not affect clinical use, it must be taken into account when one is making absorption measurements of quality. Measured kilovoltage on a group of machines at the same kilovolt settings showed wide variation. The reasons for this are discussed. Efficiency of x-ray machine output appears to be dependent primarily on the tube insert, other things being equal. Compensation for changes in efficiency should be made by changes in time and/or tube current, and not on adjustment of transformer settings of Mlovoltage.

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