Karakterisasi dan Analisis Bolus Radioterapi dari Silicone Rubber, Resin Epoksi dan Serbuk Gergaji Kayu Menggunakan Energi Berkas Elektron

Abstract

In this study, boluses were made using the melt intercalation method with a size of 11 x 11 x 1 cm3, from a mixture of silicone rubber, epoxy resin, catalyst and wood sawdust with various compositions (80:16:3:1)%wt, (80:15:3:2)%wt, (80:14:3:3)%wt and (80:13:3:4)%wt. The bolus has been characterized including physical tests (density, porosity and water absorption), mechanical tests (tensile strength and elongation at break and elastic modulus), RED, surface dose tests and linear attenuation coefficients, as well as SEM and FTIR tests. The test results showed that bolus B (80:15:3:2)%wt had optimum physical properties with a density of 1,3461 gr/cm3, porosity of 2,076% and water absorption of 1,543%. The highest tensile strength and elongation at break were 0,92418 MPa and 169,116% in bolus C (80:14:3:3)% and the highest modulus of elasticity was 0,6892 MPa in bolus B (80:15:3:2)%. The highest RED value is 1,2018 in bolus A (80:16:3:1)%. From the dosimetry properties of the bolus, the highest surface dose was at 6 MeV energy of 97,61% in bolus D (80:13:3:4)%, at 8 MeV and 10 MeV energy of 106,19% and 106,30% in bolus B (80:15:3:2)%. From the linear attenuation coefficient, the bolus (A, B, C and D) is able to absorb radiation energy at energies of 6 MeV and 8 MeV. Meanwhile, at an energy of 10 MeV, the bolus tends not to be able to absorb radiation energy, except for bolus C and D. The FTIR results show the same functional groups between the constituent materials and the bolus sample. The SEM results showed a fairly even surface morphology in the radiotherapy bolus samples. From the results of the study, it was concluded that the addition of epoxy resin and wood sawdust to bolus radiotherapy made from silicone rubber was able to increase the surface absorption dose and could be applied as a radiation absorber material