Procedures of mathematical modeling of thin solid-state converters of neutrons are described and converters a foil from natural gadolinium and its 157 isotopes are viewed. Algorithms of calculation of absorption of neutrons in a material of converters, probabilities formation of secondary electrons, probability of an exit of electrons from a material of the converter and efficiency of converters are given. Calculation is made for various thicknesses of converters, and various wavelengths of neutrons. The optimal converter thicknesses are chosen.
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 D. A. Abdushukurov, A. A. Djuraev, S. S. Evteeva et al., “Model Calculation of Gadolinium Based Converters of Thermal Neutrons,” Nuclear Instruments and Methods in Physics, Vol. 84B, 1994, p. 400.
 D. A. Abdushukurov, M. A. Abduvokhidov, D. V. Bon darenko, et al., “Modeling the Registration Efficiency of Thermal Neutrons by Gadolinium Foils,” Journal of In strumentation, Institute of Physics Publishing and SISSA. Archives of Los Alamos National Laboratory USA, 2007, 2007, pp. 1-19. http://arxiv.org/ftp/physics/papers/0611/0611225.pdf
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