Figure 3
From: Precision imaging of 4.4 MeV gamma rays using a 3-D position sensitive Compton camera
(left) Nuclear cross sections for the major prompt gamma ray emissions as a function of proton energy. 718 keV (magenta; 12C(p,x)10B*), 1022 keV (green; 12C(p,x)10B*), 2000 keV (blue; 12C(p,x)11C*), and 4438 keV (red; 12C(p,p)12C*) as calculated from the PHITS43 ver.2.93 simulation code. The primary nuclear reaction that produces positron emitters,16O(p,x)15O, is also plotted in dashed black line as a reference. (right) Comparison of the simulated 1-D distribution of the major prompt gamma rays along the proton path in the PMMA phantom obtained with the PHITS simulation. 511 keV (black), 718 keV (magenta), 1022 keV (green), 2000 keV (blue), and 4438 keV (red). The incident proton energy is 70 MeV. The vertical axis represents the number of emitted gamma rays as normalized with the incident number of protons.
