Figure 1
From: Precision imaging of 4.4 MeV gamma rays using a 3-D position sensitive Compton camera
Gamma-ray spectra for 70 MeV proton irradiation on various phantoms, obtained with an HPGe detector for on-beam (red) and off-beam (blue) conditions. (upper) Water, (middle) PMMA, and (bottom) Ca(OH)2. The thick green curve in the PMMA spectra indicates an energy window applied for 4.4 MeV gamma ray imaging using the 3D-PSCC.
