The generating equipment of medicas radiations requires of an suitable methodology to evaluate the fisicas amounts: absorbed dose, half-value thickness (CS), yield, among others to assure the optimal conditions of use.

The results show that the parametrizadas functions consider the amounts of absorbed dose, half-value thickness and of the yield with smaller uncertainties to 2%, and reproduce the experimental datas with smaller errors to 8%.

Keywords: half-value thickness, doses, functions, parametric, x-ray Corresponding author.