Ionization chamber dosimetry based on Co absorbed dose to water calibration for diagnostic kilovoltage x-ray beams.

The purpose of this study was to develop a new ionization chamber dosimetry formalism for diagnostic kilovoltage x-ray beams based on a Co absorbed dose-to-water calibration coefficient [Formula: see text]. To validate the new chamber dosimetry, 39 fluence spectra of kilovoltage x-rays were calculated, using a SpekCalc program, for Al half-value-layer (Al-HVL) values of 1.4-8.