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The results of two sets of calculations of the non-equilibrium ionization electron density based on a three-energy level model of the cesium seed atom is compared with the widely used approach to the calculation of non-equilibrium ionization electron density by substituting the electron temperature in Saha's thermal equilibrium ionization equation. In one set of calculations the rate coefficients for both collisional and radiative reaction processes are included, with the rate coefficients for radiative decay from the first j-excited state doublet of cesium to the ground state level including or ignoring the effect of imprisonment of resonance radiation. In the other set of calculations the photo-ionization and photo-excitation rate coefficients are excluded.