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Dosimetry of Sr‐90 ophthalmic applicators
Author(s) -
Reft Chester S.,
Kuchnir Franca T.,
Rosenberg Ivan,
Myrianthopoulos Leon C.
Publication year - 1990
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596494
Subject(s) - dosimetry , thermoluminescent dosimeter , dosimeter , calibration , thermoluminescent dosimetry , materials science , dose profile , ionization chamber , nuclear medicine , optics , dose rate , medical physics , biomedical engineering , medicine , physics , ion , quantum mechanics , ionization
Sr‐90 ophthalmic applicators are commonly used for the treatment of superficial eye disorders. Although a variety of dosimetric devices such as film, thermoluminescent dosimeters (TLD's), ion chambers, and radiochromic foils have been used to measure the peak dose at the applicator surface, there is no internationally agreed upon calibration procedure. Recently, large discrepancies among calibrations of the same applicator at three institutions have been reported. Here we describe a technique to obtain the peak dose rate at the applicator surface using LiF TLD's. The technique can be used for the calibration of flat as well as curved surface applicators. Results for two flat and three concave applicators are presented. Our measurement of the surface dose rate for one of the flat applicators is compared with those obtained by four other institutions, each using different dosimetric devices.