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Nationwide evaluation of 60 Co teletherapy calibrations
Author(s) -
Dicey Bruce B.,
Moe Harold J.,
Tongue Thomas M.
Publication year - 1978
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 - 10.1118/1.594485
Subject(s) - thermoluminescent dosimeter , calibration , medical physics , licensee , dosimetry , nuclear medicine , sampling (signal processing) , medicine , statistics , computer science , physics , optics , mathematics , dosimeter , operating system , detector , license
As a result of a reported incident which resulted in the unintended overexposure of several hundred patients, teletherapy installations throughout the United States were evaluated to verify the accuracy of teletherapy equipment calibrations. Selected licensees received TLDs for exposure under specified conditions. Site visits were made to each licensee showing an apparent discrepancy greater than ± 5% and intercomparison measurements made. This paper describes results of a sampling of 373 teletherapy licensees and the success of site visits in reducing final discrepancies to less than ± 5%. TLD and site visit measurement techniques, results, comparison with data from other studies, and possible sources of uncertainty in the management of a large‐scale screening program are discussed.