Abstract
Dose-rate patterns from various 137Cs loadings of Fletcher and rubber cervical applicators have been measured with X-ray films calibrated against cavity ionization chambers. Relative measurements indicate that comparable loadings produce about 20% lower dose rates from the Fletcher applicators than from the rubber applicators at points of anatomical interest within about 2 cm of the tandem, while producing similar dose rates at distances of 5 cm or more. Oblique ray filtration and other design features of the applicators may account for these differences. The Kodak RPM Ready Pack Films have a linear density against dose response up to optical densities of 2 or greater (up to about 10 rads produced by 137Cs gamma -rays within a phantom). Uniformity of films within a box, repeatability of optical density readings and the small diameter and film thickness traversed by the densitometer light beam also contribute to allow the measurement of an entire dose pattern in any plane with respect to an applicator with a single film. The precision obtained is about +or-2% at any given point located within +or-1 mm from 0.5 to 10 cm from the applicator.
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