Figure 2.

Schematic diagram of the heterogeneous phantom geometry used in Monte Carlo simulation in this project. This phantom shows skin, adipose, cortical bone, and soft tissue layers. The dimension of the cubic phantom are $15 \text{cm}\times 15 \text{cm}\times 15 \text{cm}$. (a) The radiation field is assumed to be 2 cm diameter circular and parallel; (b) the radiation point source with Tungsten applicator by opening angle of 75° and 1.5 cm SSD. ⁽¹⁰⁾