**3.2 192Ir HDR source**

For the 192Ir HDR source, model GI192M11, manufactured by E & Z BEBIG, was simulated in this work, the comparisons with the published data included: Ir2.A852, Flexisource, and GammaMed models. The BEBIG GI192M11 simulated in this study was composed of homogeny iridium 192 cylindrical core with L = 3.5 mm (length) and 0.6 mm in diameter, the density of iridium used in this work was 22.56 gcm�<sup>3</sup> . The active core is surrounded by an air shell and then encapsulated in a stainless steel

**Figure 1.**

*(a) Schematic representation for the 60Co source (model: Co0.A86). (b) Schematic representation for the 192Ir source (model: GI192M11) (dimensions in mm).*

cylindrical capsule of 0.15 mm thick and 1 mm for the external diameter, The source cable length and diameter used in this study, we consider, are 2 mm and 1 mm, respectively, **Figure 1b**; the activity of the iridium source used in this work was A0 = 370GBq, and the iridium 192 half-life is t1/2 = 73.81 days. The density used for the stainless steel is the same as used for the 60Co (Co0.A86) source.
