Figure 4

(a) The comparison of PDDs obtained from Monte Carlo simulations performed for measurement (MCmea) and TPS conditions (MCpla) for titanium, alloy 600, and tungsten inserts. Visualisation of the insert geometry, (b) two halves of the grey circle with a film gap between them (MCmea conditions) and (c) solid grey circle without film gap (MCpla conditions). The red arrows visible in (b) and (c) represent the radiation beam.