Figure 1.

Experimental setup. Schematic drawing of the experimental setups. For film, cell sample, and ionization chamber experiments the target was moved on a sliding table left-right in beam's eye view (BEV). Proximal to the target, a ramp-shaped absorber was installed stationary such that lateral compensation induces range changes since the beam traverses this absorber at a different thickness. Films were positioned stationary directly behind the absorber as well as on the sliding table. The 24 ionization chambers are mounted within a water tank that is positioned on the sliding table. Data were acquired at two array positions as shown in (c) as bold and regular circles. For cell survival measurements two MicroWell plates where used with cell survival measurements performed at the positions indicated in (b). (d) For range validation, a range telescope in the target area was used to measure the relative ionization of two parallel-plate ionization chambers (I1 and I2). Range changes were induced as described in (a).