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American Journal of Roentgenology, Vol 103, 734-737, Copyright © 1968 by American Roentgen Ray Society

MEASUREMENT AND CORRECTION OF NONUNIFORM SURFACE DOSE RATES FROM BETA EYE APPLICATORS

WILLIAM R. HENDEE PH.D.1

1 From the Department of Radiology, University of Colorado Medical Center, Denver, Colorado

A differential filter has been constructed from aluminum foil to reduce the dose rate nonuniformity across the surface of a commercial Sr90-Y90 applicator. The surface dose rate varies from 10.0 to 15.4 rads/sec. with the filter in place, and from 12.6 to 30.2 rads/sec. with the filter absent. The filter does not change the per cent depth dose distribution from the applicator in tissue. More uniform doses to treated lesions are achieved with the filter, and improved clinical results are expected. A second filter has been designed to shield regions peripheral to treated lesions less than 4.0 mm. in diameter. Dose rates across the applicator surface, with and without filters in place, were measured with LiF thermoluminescent powder.


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J. ICRU, December 1, 2004; 4(2): 165 - 175.
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