Abstract
With the aid of the Monte Carlo method, the ratio of the collision kerma for ICRU tissue equivalent material and the receptor-free air collision kerma was calculated for various depths in the 30 cm IAEA water cube phantom when irradiated with parallel broad photon beams from different directions of incidence relative to the phantom's front face. The calculations were performed for monoenergetic photons with energies between 2keV and 1 MeV. The results can be interpreted as the angular-dependent conversion coefficients between the receptor-free air collision kerma and the dose equivalents in the IAEA water cube that are of practical importance in calibrating individual photon dosemeters if the water cube is used as a calibration phantom.
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