Abstract
Diagnostic X-ray tubes produce X-ray beams which are non-monoenergetic; nevertheless for a given tube potential setting, materials exhibit nearly constant absorption coefficients below the tenth value layer. Below 10% transmission, these 'effective' linear absorption coefficients were obtained for vanadium in the 60 to 135 kVp range. These data indicate that by using vanadium filtration, kVp can be determined in the field to 5% uncertainty when compared with bleeder bank measurements made in the laboratory. Preliminary results indicate that regardless of the high-voltage waveform applied to the X-ray tube, 7% uncertainty can be obtained over the same kVp range.
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