Engineering Physics Annotation << Back Analysis of nonrelativistic and relativistic electrons ranges in a model of the generalized diffusion Konov K.I. Nikerov V.A. Within the framework of the generalized diffusion model for media with atoms charge number Z in the range from 1 to 82, the maximum length of a thin layer, providing the straightforward transport of nonrelativistic electrons, is calculated. It is shown that the use of thin layers formulas for ranges in thick layers gives overestimated in times values. This error occurs when Z> 3, and for Z = 82 the value is 5 times more than the true value. Significantly, that in accordance with the model of the generalized diffusion, the layer with five times more thickness than the average range, weakens the flow of electrons for many orders. The characteristic error of ranges calculation, which is caused by incorrect use of the average atoms charge number of the media and mixtures consisting of atoms with substantially different charge number is also analyzed. It is shown that this overestimation occurs for electrons ranges in polyethylene, polystyrene, and hydrogen chloride and is equal to 10…23 %. The simple and comfortable to use in complex modeling formulas for the mean free path along the coordinate of relativistic electrons in different media are provided. Key words: non-relativistic and relativistic electrons, generalized diffusion, electron mean free path along the coordinate. Contacts: E-mail: n@wswr.ru Pp. 07-12.