Calorimetric determination of the absorbed dose-to-water beam quality correction factor kQ for high-energy photon beams.
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).
Vatnitsky
S M
SM
Department of Radiation Medicine, Loma Linda University Medical Center, California 92354, USA.
Siebers
J V
JV
Miller
D W
DW
D055592:Biophysical Phenomena; D001703:Biophysics; D002151:Calorimetry / Q000379:methods*; D006801:Humans; D017785:Photons / Q000627:therapeutic use*; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D013679:Technology, Radiologic; D014867:Water
D014867:Water