Abstract
A series of Monte Carlo simulations has been performed to determine the behavior of the factor fc,Q as a function of the usual quality indexes for medium energy X-ray beams. Up to 46 beams, with spectra generated with the codes xcomp5r and SpekCalc, for potentials up to 300kV, were transported using the Monte Carlo code penelope to calculate the doses in water and in a PTW 30001 ionization chamber, both at the reference depth. The half-value layer (the usual quality index for these beams) and other two quality indexes, the generating potential and the homogeneity coefficient, have been considered. The calculated fc,Q factors are well described with a function that involves the power of the half-value layer up to the square and a second quality index linearly. The predictive power of this combination has been studied.
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