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    The program ModeGR was designed specially for simulation of the absorbed dose distribution within multi-layer packages irradiated with gamma ray from flat panoramic 60Co source rack. The 60Co source rack can be represented as a rectangular planar frame with number of modules from 4 up to 20, which should be mounted in two levels, with uniform/non uniform distribution of 60Co strength.
    The product on a conveyer platform can be irradiated in tree modes:

    • stationary mode - the container with product will irradiated in stationary regime;
    • continuous mode - the container with product will continuously move on a conveyer platform in parallel with surface of source rack;
    • shuffle-dwell mode - the container with product will discontinuously move on a conveyer platform in parallel with surface of source rack to a new irradiation position and then remaining at rest for a dwell time at that position. Where the dwell time is the time interval during which a process load is at rest at an irradiation position.

    Irradiated product can be represented in form of container with homogeneous materials as well as of container with stack of plates.  The stack of plates can be interleaved with dosimetric films. Software ModeGR provides simulation of the following methods of product container irradiation with gamma ray:

    • product containers are moved around a radiation source on a conveyor a few times  (generally, 1 to 4 passes), and may also travel at different levels.
    • conveyor system provides the following regimes irradiation the product containers, such as stationary, one pass continuous, multipass continuous or multipass shuffle–dwell.
    • product containers  are moved around the radiation source on conveyors  at one, two or more levels. Two and more levels are characterized by horizontal and vertical movements of the product containers.
    • product containers can be multi-sided irradiated: at one-, two-, or four sided.
    • two types of irradiation geometry: product overlap irradiators and  source overlap product.
    • For product-overlap arrangement, the combined height of two containers is more than the height of the source rack and each container travels around the source at two levels.
    • For source-overlap arrangement, the height of the source rack is more than that of the product container and each container travels at one level only.
    • lateral dose variation in gamma irradiated product can be reduced  including placing the higher-activity source pencils near the periphery of the source rack, so called source activity augmentation method.

    A source of gamma rays, 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 irradiation process are calculated with use of a Monte Carlo method. The software ModeGR provides the end-user with data sets in the graphic and tabular form the 2D and 3D absorbed dose distribution within the product irradiated with gamma ray from flat panoramic 60Co source rack.

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

    • choice of optimum conditions, the configuration, 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 features of the software ModeGR are as follows:

    • Two levels for entering of input data via configuration files and manually.
    • Built-in tools for statistical analysis.  
    • Built-in tools for uncertainties estimation of results simulation due to uncertainties of input data for radiation facility.    
    • Estimation of uncertainties for physical models.
    • Built-in tools for dose volume histogram analysis.
    • Comparison Modulus for visual and a numerical analysis of calculated and experimental data and for decision of optimization tasks in radiation processing. 
    • Built-in tools for processing of experimental dosimetric data and their comparison with simulation predictions.

    The software have intuitively clear graphical interface for the end-users with the following features:

    • Detailed decomposition of input data for main elements of source and target (including spectral characteristics for irradiation source).
    • Two levels for entering of input data via configuration files and manually.
    • Expert control for the range of input data and coordination  for the set of geometrical and physical input data.
    • Compatibility of export an input data to different modules.

    The software ModeGR works on platform Windows98/Me/NT/XP/2000.Language of the interface - English.

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