The simulated dose as scored in voxelized slab and cylindrical phantoms are shown in (a, c) and sampling regions and sensitivities (probability normalized by sum of the quantity in all the voxels) of surface-escaped Cherenkov radiation are shown in (b, d). These examples show the sampling sensitivity of surface escaped Cherenkov radiation in the cases of entrance/exit surfaces of the slab and the side surface along the arc of the cylinder. The color map used was MATLAB Jet, with red highest and blue lowest. In (a, b), the beam was from coming down from the top, and in (c,d) the beam was from the side.