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A method for measuring the characteristic, which makes possible to find the energy spectrum of the electron beam of the accelerator is described. This method uses the magnetic analyzer, which is based on the scanning system of the standing wave linear electron accelerator, mounted on the radiation sterilizer. This characteristic is the dependence of beam current, that reaches the induction sensor at the accelerator output window, on the magnetic field, deflecting the beam from the axis of the system. The results of the measurements of these characteristic, which were performed on the sterilization installation in MRTI, are presented. The computer simulation of electron beam dynamics in the scanning system for the case of these experiments was performed with the help of developed program "BEAM SCANNING". The similar dependence of the beam current on the magnetic field was obtained. The necessity of taking into account the effect of electron reflection from the walls of vacuum chamber is stated. To describe this effect the additional features were implemented in the program. As a result of calculations with the account of this effect, the correspondence of the calculated curve and experimental one was reached. This means that the calculated spectrum corresponds to the actual energy spectrum of the electron beam in the experiment.
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