Karakterisasi Silicone Rubber, Alginat, dan Serbuk Gergaji Kayu Sebagai Bolus Radioterapi Pada Energi 8 Mev dan 10 Mev

Abstract

This study aims to characterize silicone rubber, alginate, and wood sawdust as radiotherapy bolus at 8 MeV and 10 MeV energy. Radiotherapy bolus is used in radiation therapy to increase the radiation dose to tumor tissue while protecting the surrounding healthy tissue. The process of making the radiotherapy bolus begins with sieving the sawdust powder through a 200 mesh sieve. Mixing all radiotherapy bolus materials such as silicone rubber, alginate, Catalist bluesil, and wood sawdust as filler, and then molded into sizes of 0.5 cm, 1 cm, 1.5 cm, and 2 cm, followed by oven curing at a temperature of 30°C. The method used in the production of the radiotherapy bolus is the melt intercalation method. The radiotherapy bolus is characterized to determine the values of physical properties (density, porosity, and water absorption), mechanical properties (tensile strength, elastic modulus, and elongation), performance properties (relative electron density and surface dose absorption), SEM, and FTIR. The results of the physical property tests indicate that the optimum density value is 1.80 g/cm3, porosity is 20%, and water absorption is 12,5%. The mechanical properties show an optimum tensile strength of 0.85 MPa, elastic modulus of 0.66MPa, and elongation of 198.24%. The performance property tests show an optimum relative electron density of 1.26 and surface dose absorption at 8 MeV energy of 113.27% and at 10 MeV energy of 113.48%. The SEM analysis reveals an average pore diameter of 21.25 μm. The FTIR analysis of the Radiotherapy Bolus shows peaks at 3384.97 cm-1 corresponding to the O-H functional group, 2962.8 cm-1 for the C-H functional group, 1256.64 cm-1 for the CO functional group, 1014.01 cm-1 for the Si-O-Si functional group, and 790.14 cm-1 for the Si-CH functional group.