X-ray spectra and doses

Using the Monte Carlo method the x-ray spectrum produced by 150 keV electrons colliding with W, Rh and Mo targets were calculated. The x-ray spectra were calculated to 20, 50, and 100 cm from the focal point. In order to analyze the effect of the filter, calculations were carried out with and without filter. The spectra were used to estimate the Kerma in air, the Ambient dose equivalent, and the Personal dose equivalent. The spectra were integrated in energy to obtain the total photon fluences. Calculated spectra depend on the type of target having the continuous spectrum due to bremsstrahlung and the characteristics x-rays. The Al filter eliminates the low-energy photons; however no effect is noticed when the photon energy is larger than 40 keV. The largest effect of dose reduction due to the filter was noticed to 20 cm for the Kerma in air. (C) 2016 Elsevier Ltd. All rights reserved.