[en] The column calibration factors F_s as a quadratic function of the mean temperatures T-bar are worked out from the estimated values of the logarithmic maximum separation factors ln q_max of inert gas isotopic mixtures and their available TD factors α_Ts' in three columns of comparatively larger geometrical lengths and of varying sizes. The ln q_max are determined from the pressure dependence of ln q_e in those columns measured by W.M. Rutherford et al. and W.J. Roos et al. The nature of temperature variation of F_s, which depends entirely on the column geometry, allows us to estimate the temperature dependence of α_Ts' for a wide temperature range. Our α_Ts' through the use of F_s are shown to have almost the same order of magnitudes and the same trends as the theoretical ones, while there are larger discrepancies when α_Ts' are estimated by other methods. This signifies the usefulness of F_s in column measurements. (author)