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Schematics of the collimated PG camera projecting the PG (green lines) produced by the impinging protons (blue lines) on the position sensitive detector beyond the collimator. The upper insets depict the table-mounted U-shaped range shifter (a), the camera trolley positioning system (b) and the camera knife-edge slit collimator (c). Reprinted from Xie et al73 with permission. PG, prompt γ.
