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a): Render of the Mark I-68 air cavity (cyan) surrounded by lead (gray). The source guide and active unit are shown in layers of 304 stainless steel (yellow and gray cylinders). A Dose-Map™ cassette is used for quantitative calibration (magenta and red box). b) X-Rad320 MC model with the Dose-Map™ cassette (x-ray photon trajectories are drawn as green lines).
