Abstract
For the purposes of type testing extremity dosemeters, the conversion coefficients between the receptor-free air collision kerma and the collision kerma for 4-element ICRU tissue have been calculated at a depth of 0.07 mm in two right-angled circular cylinder phantoms made of 4-element ICRU tissue and irradiated by extended plane-parallel photon beams of oblique incidence relative to the cylinder's main axis. The cylinders were 30 cm in length and 1.9 cm or 7.3 cm in diameter, representing a finger or the lower arm. The calculations were performed by Monte Carlo simulation of the energy transport of monoenergetic photons through the phantoms as a function of energy and of the angle of incidence. The angle was varied between 0 o and 90 o, the energy between 4 keV and 1.25 MeV. The results for monoenergetic photons have also been used to derive the corresponding conversion coefficients for a variety of X ray beam qualities frequently employed in the procedure for calibrating and type testing personal radiation protection dosemeters.
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