Figure 2
From: Precision imaging of 4.4 MeV gamma rays using a 3-D position sensitive Compton camera
(upper) The first experimental image of the 4.4 MeV prompt gamma rays reconstructed from the 3D-PSCC measurement. The white box indicates the region where the eight PMMA slab phantoms (0.5 cm width) were placed, and the dotted line marks the position of the Bragg peak for 70 MeV protons. (lower) 1-D projection along the proton path (shown in blue) of the 4.4 MeV gamma-ray image presented above, and a comparison of the energy deposited by protons (red histogram) obtained from the PHITS simulation.
