A New Technology for Fast Two-Dimensional Detection of Proton Therapy Beams

Figure 9

Reproducibility of the chamber response in the proton beam. The detector was irradiated in one-second intervals. The integrated response of the chamber is constant across the 42 measurements to 0.8% (1σ). The signal fluctuates on about a one-minute timescale and is likely due to a drift in the beam current.