In Japan and North America, two different dosimetry protocols (JSMP Standard Dosimetry 12 and AAPM TG-51) are used to measure absorbed doses to water, and a study compared these methods for high-energy photon beams.
The study found that the absorbed dose ratios between Canadian and Japanese references ranged from 0.995 to 1.007, mainly affected by wall correction factors in the beam quality corrections when radial dose distribution impacts were minor.
Upon experimental validation, discrepancies in calibration factors between Japanese standard dosimetry laboratories led to a higher ratio of Canadian to Japanese absorbed dose (up to 1.015), suggesting a need for improved accuracy in wall correction factors and regular comparative tests between Japanese