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    mode picture

    Some results of simulation by the program ModeRTL for 5 MeV electron beam

    Figures 1a and 2b represent some results of the depth-dose distribution within the sample of polymer composite materials (PCM) calculated by Monte Carlo method at one- and double treatment of the irradiated materials from opposite sides.

    Irradiated target is compound (wood of aspen + 70% polymethylmethacrylate, PMMA) with density 0.8 g/cm3.

    Triangular scanning.

    Electron energy - 5 MeV.

    Average beam current - 1 mA.

    Thickness - 5.65 cm.

    Statistical deviation 0.25% for center and 2.6% for boundary, running time less than 3 minutes on PC AMD-K7, 750 MHz .

     

     

     

     


    Figure 1a and b. 2D-view of the depth-dose distribution in the sample of PCM.
    One- and two-sided irradiation.

     Figure 2a and b. 3D-view of the EB dose mapping within compound at one-sided irradiation (a) and for optimal targets thickness at double-sided irradiation (b).

    3D-view of the depth-dose distributions near the boundary of wooden block with air at various inclination angles β of the target are presented in Figs. 3(a) and (b): β = 0 degree (Fig. 3(a)) and β = 3 degree (Fig. 3(b)). Wooden block is irradiated by scanning electron beam at double-sided.

    Figs. 3(a) and (b). 3D-view of the depth-dose distribution near the boundary of wooden block with air at different inclination angles β of the target: β = 0 degree (Fig. 3(a)) and β = 3 degree (Fig. 3(b)).

    The compare results for EB depth-dose distributions in a plane, which cross the center (curves 1 and 2) in the direction of moving conveyer, and the boundaries (curve 3) of an irradiated target at the end of scan beam direction (see Fig. 4 (b)) at double-sided irradiation are shown in Fig. 4 (a).
    Curves 2 and 3 simulated by MC method, curve 1 - by Analytical method.
    As is seen from Fig. 4 (a), the good agreement between depth-dose distributions in a plane, which cross the center calculated by Analytical method (curves 1) and simulated by MC method (curve 2) is observed. It allows to use Analytical method for fast optimization of irradiation regimes and integrate it in control system of radiation facility.
    The simulation results by MC method of the charge deposition in the center and the boundaries of compound irradiated by 5 MeV electron beam are presented in Fig. 4(b).

    Figure 4 a and b. The compare results for EB depth-dose distributions in a plane, which cross the center (curves 1, 2) in the direction of moving conveyer, and the boundaries (curve 3) of an irradiated target at the end of scan beam direction at double-sided irradiation (a).

    Charge deposition in PE target irradiated with scanned EB

    2D-view (left) for charge depositions in the center (green curve) and the boundaries (blue curve) of PE target irradiated with scanned 2 MeV electron beam. 3D-view (right) for charge depositions in PE target. Target depth 1.2 cm (axis X), target width 10 cm (axis Y), width of scanning 1cm (axis Y).

    Point Beam
    One-side Irradiation

    SOURCE
    Energy -10MeV
    Diameter - 4cm.
    SCANNING
    Width of scanning-0.01cm.
    Non-diverging beam
    TARGET
    Object - PMMA
    Density-0.1g/cm3
    Thickness-40cm
    Width-40cm.

    2D Temperature

    Point Beam
    SOURCE
    Energy - 10MeV
    Diameter - 4cm.
    SCANNING
    Width of scanning-0.01cm.
    Non-diverging beam
    TARGET
    Object - PMMA
    Density-0.1g/cm3
    Thickness-40cm
    Width-40cm.
    Cooling time = 0 min

    Point Beam
    SOURCE
    Energy - 10MeV
    Diameter - 4cm.
    SCANNING
    Width of scanning-0.01cm.
    Non-diverging beam
    TARGET
    Object - PMMA
    Density-0.1g/cm3
    Thickness-40cm
    Width-40cm.
    Cooling time = 60 min

    Point Beam
    SOURCE
    Energy - 10MeV
    Diameter - 4cm.
    SCANNING
    Width of scanning-0.01cm.
    Non-diverging beam
    TARGET
    Object - PMMA
    Density-0.1g/cm3
    Thickness-40cm
    Width-40cm.
    Cooling time = 300 min

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