Fig. 4
From: Helium ion beam imaging for image guided ion radiotherapy
Evaluation of the detector response changes after irradiation by a cumulative fluence of 4.64 × 1011 protons/cm2 with an energy of 200 MeV. Changes of the mean cluster signal (equal to cluster volume) during (left) and after (right) the high fluence irradiation are shown. The changes are depicted for both the highest (430 MeV) and the lowest (89 MeV) monoenergetic carbon ion beams available for therapeutic treatments at the HIT facility. Figures are from [5]