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Calorimetric determination of the absorbed dose-to-water beam quality correction factor kQ for high-energy photon
S M Vatnitsky1, J V Siebers, D W Miller
1Department of Radiation Medicine, Loma Linda University Medical Center, California 92354, USA.
Medical Physics
|November 1, 1995
Abstract:
A method has been developed for measuring photon beam quality correction factors kQ using direct transfer with a water calorimeter. kQ values were measured for beam qualities varying between 6 and 23 MV for a Capintec PR-06 and a PTW W30001 cylindrical ionization chamber. Measured values were intercompared with published sets of computed kQ values and agreement was found to be within measurement uncertainty (1%, one standard deviation).