Figure 4From: Hybrid monitoring and measurement of concrete shielding activation at the ProtherWal proton therapy centreRemovable core position in the vault concrete shielding. The shielding walls in Low Activation Concrete are shown in light grey. Some walls are shown as transparent for visualization purposes. The first part of the P1 BDSIM model is shown with the S2C2 in green, the quadrupoles in red, the slits in dark green and the degrader wheel in greyBack to article page