[en] Presented are results of the analysis of radial saturation of a non-steady neutron field produced by a 14-MeV pulsed neutron generator in constructing reference standards for the PNL logging tool. These standards were constructed as formation models reproducing such parameters as porosity and neutron characteristics of rocks - thermal neutron absorption macro cross-section and diffusion coefficient. Radial sizes of standards depend crucially on the sounding depth of PNL. Radial sizes were found with due regard of known 2-group diffusion calculations (A. Shkolnikov and S. Kantor, 1976) and original Monte-Carlo calculations made together with V. Velizhanin. The comparison evidences of the overestimated radii of saturated models proposed by a 2-group diffusion approximation as compared to Monte-Carlo values. Analyzed are functions of integral and differential radial sensitivities of the PNL response (density of thermal neutron flux) for PNL spacing of 0-100 cm, time delay of up to 3 ms (with a time discretization of 50 mcs), for the formation porosity of 0, 10, 20, 30, and 40 %. Compared are the contributions of axial layers to the PNL response depending on the tool's spacing and formation porosity. (author)