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    ModeXR

    The program ModeXR was designed specially for simulation of industrial radiation processes and calculation of the absorbed dose distribution within products irradiated by scanned X-ray (bremsstrahlung) beams on industrial radiation-technological lines (RTL) that is based on the pulsed or continuous type of electron accelerators in the energy range from 0.1 to 50 MeV. A source of electron beam, a scanner, X-ray converter with cooling system, a conveyor line, an irradiated product and a package are considered in uniform self-consistent geometrical and physical models. Differential and integrated characteristics of an X-ray irradiation process are calculated with use of a Monte Carlo method. The software ModeXR provides the end-user with data sets in the graphic and tabular form for the X-ray energy spectrum generated in an X-ray converter, a dose distribution value, a temperature distribution within the objects irradiated by a scanned X-ray beam with energy from 0.1 up to 50 MeV.

    The ModeXR contains a set of tool means for the comparative analysis of the obtained data for absorbed dose of X-ray beams. Service blocks of the program, in reporting forms, give the user the necessary and sufficient information for decision-making at:

    • choice of optimum conditions, parameters and operating modes of the radiation facility;

    • configuration of the irradiated objects with taking into consideration of features irradiated materials;

    • organizations of a dosimetric control during materials processing;

    • confirmation of a correctness (verification) of results of the carried out irradiation.

    The feature of the software ModeXR is unique high running speed of calculation schemes. It is reached due to:

    • use of a forced method for process of producing X-ray on each step of design of electron track in a construction of the X-ray converter.

    • automatic choice of self-consistent parameters is used for simulation of an electron - photon shower. The choice is based on determination a minimum machine time for obtaining given accuracy. These parameters are the following: cutoff energy for modeling of an electron track, threshold energy of catastrophic electron-electron collisions, cutoff energy for modeling of a photon track, threshold angle of grouping electron collisions for modeling of scattering.

    • use of both a simple estimation (collision method) and the special estimation (method of crossing area) for the dose calculation.

    • implementation of the simulation MC methods the specially designed schemes which allow to reduce a running time for receiving of the end results in about hundreds time were applied.

    Input data for the program ModeXR are the following:

    • Parameters of electron beam: average beam current, or pulse duration and repetition frequency in pulsed accelerators, electron energy spectrum, beam diameter and spatial distribution of the beam intensity.

    • Parameters of scanning system: modes of operation, the triangular or non-diverging irradiation treatment field in target material; form of current in magnet of scanning system; repetition frequency of scanning; angular distribution of electron beam at the outlet of a scanning system; parameters of the exit window for EB.

    • Parameters of the X-ray converter with cooling system: geometrical characteristics of the X-ray converter with cooling system, thickness of plates (layers) and cooling agent, materials composition, distance between exit window and X-ray converter.

    • Parameters of conveyor line: speed and geometrical characteristics of the line.

    • Parameters of irradiated product: geometrical characteristics of the irradiated product; elemental composition of the target material and weight concentrations of component; material and size of the covering for irradiated product.

    • Regimes of irradiation: one- and two-sided irradiation.

    The program ModeXR was used for:

    • calculation of the different construction variants of X-ray converter with cooling system on its conversion efficiency from electron beam to X-rays versus materials composition and thickness of converter plates and cooling agent;

    • calculation of the optimum thickness of the converter plates;

    • simulation of the X-ray energy spectrum;

    • simulation of the absorbed dose and temperature distribution within irradiated products, calculation of the optimum product thickness at double treatment of the irradiated materials from opposite sides, and dose uniformity ratio;

    • calculation of the X-ray utilization efficiency in the irradiated products, electron beam power utilization;

    • calculation of other important characteristics of X-ray-product interaction for economic evaluation of X-ray processing.

    The software ModeXR works on platform Windows98/Me/NT/XP/2000. The software has intuitively clear interface of the end-users. Language of the interface - English. The software ModeXR takes into account the features of two modifications of geometrical model for system of EB scanning with vertical ModeXR-v and horizontal ModeXR-h locations.

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