  With the intention of creating a complete simulation of the Thick GEM
detector, this work presents a partial simulation of the interaction of 6 keV
X-Ray radiation with a gas volume. For the gas, it was used pure Argon, Xenon
and CO2 as well as a mixture of each noble gas with CO2 in a 70\%-30\%
proportion. For this range of energy, the dominant physical effect is the
photoelectric, therefore knowing the binding energies of the atoms we predict
the kinetic energy of the primary electron. A simulated energy spectrum of the
primary electron kinetic energy was obtained, which contains peaks
corresponding to the inner shell's ionization of the atoms. The spectrum shows
very little Compton effect, transferring only small energies (in the order of
eVs). We concluded that energy spectrum for the mixture is a linear combination
of the spectrum of its individual components.
