Fig.1.

In (a) Experimental schematic of the proposed optical dosimetry system. The telecentric lens captures optical rays emerging from the transparent water tank that are near parallel to the optical axis and focuses them onto the ICCD. The two field shapes corresponding to the primary and multileaf collimator are shown in green. In (b) the atomic diagram of the radiation transport interactions governing electron energy loss in water. In (c) the electron energy loss per unit path length resulting in local energy deposition and emitted Čerenkov photons as a function of electron energy.