Measurement of Surface Dose Increase in Radiotherapy Boluses Using Polymer Clay Material Mixed with Al2O3 Metal Powder

Abstract

Bolus is a means of radiotherapy which is made from material equivalent to tissue and is placed directly on the surface of the skin during the radiotherapy process. A bolus is used as a replacement for missing tissue or a flat surface in the direction of the radiation beam. The result is an even distribution of dose on the isodose curve. The material commonly used as a bolus is wax which is basically equivalent to tissue and has high strength. The aim of this research is to analyze the effect of Polymer Clay boluses on increasing surface dose and determine the characteristics of Polymer Clay boluses in terms of variations in bolus thickness. By looking at the detector dose value and comparing the bolus thickness variation graph with the Percentage Depth Dose (PDD) value. The modality used in this research is Linear Accelerator (LINAC). The bolus dose results can be seen from the Gading Pluit Hospital computer and transferred to Excel after that to obtain the graph using OriginPro software. It can be seen that there is an effect of the bolus of the polymer clay material with increasing surface dose, that is, with each increase in bolus thickness and increase in energy, the surface dose increases and when it reaches R100, the dose at the next thickness will decrease.

Keywords: Polimer clay, Bolus, Radioteraphy, Linear Accelerator, Percentage Depth Dose