Example city street model and gamma-ray flux from three source locations. The image on the left shows an overhead view, with asphalt areas in white, concrete areas in grey, soil areas in green and buildings colored by their the type of exterior construction material (red - brick, brown - granite and dark grey - concrete). The three other images show the Monte Carlo computed flux intensity at three different source positions. Each change in color represents a decrease in flux by a factor of 10.
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