title: Calorimetric determination of the absorbed dose-to-water beam quality correction factor kQ for high-energy photon beams.
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).
authors.affiliation: Department of Radiation Medicine, Loma Linda University Medical Center, California 92354, USA.
authors.forename: S M
authors.initials: SM
authors.lastname: Vatnitsky
authors.forename: J V
authors.initials: JV
authors.lastname: Siebers
authors.forename: D W
authors.initials: DW
authors.lastname: Miller
mesh_terms: 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
chemical_list: D014867:Water