nential. This is because the interaction mode and geometrical mode are both contributing to the attenuation of the flux. However at 45 to 50 cm from the rack, a quicker decay takes over. 50 cm from the source is about half way through the window structure, and 100 cm is approximately the distance where the window ends and the large empty space of the room begins. More insight into this effect can be seen in the flux contour maps below.
These two figures show top and side views of the rack and Gamma Irradiation Facility geometry with a contour map of the total gamma flux vs. position. Here, the “wave-like� spreading out behavior of the gamma emissions can again be seen. This is shown as the magnitude of the photon flux being equally dispersed in several plane waves. The
Figure 7: Plots of Total Gamma Flux as a Function of Distance from Rack (Facility Model)
Figure 8: Top View (Left) and Side View (Right) Total Flux Contour Plot
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