Analysis of the Effect of carbon fiber utilization on Cobalt-60 Teletherapy to the depth dose and the surface dose
Journal Title: International Journal of Innovative Research in Advanced Engineering - Year 2017, Vol 0, Issue 0
Abstract
The research about the effect of carbon fiber on cobalt-60 teletherapy type GWXJ80 to the depth dose when gamma rays passed the carbon fiber couch and its effect to the surface dose has been conducted. Depth dose has been measured using ionization detector 0.65cc Extradin A12 model with the buildup cup that is connected to the electrometer Max4000 (Standard Imaging). Depth dose data have been obtained from 5 cm, 6 cm, 7 cm and 9 cm of depth with angle variations of each depth are from 0o - 360o (10o angle interval ). The result of measurement has been processed using TRS398 protocol. The Surface dose measurement were performed using Gafchromic EBT2 film which was placed on the surface of slab phantom with and without carbon fiber. Irradiation field of this measurement were 6x6cm2, 8x8cm2, 10x10cm2, 12x12cm2, 14x14cm2, 16x16cm2 and 18x18cm2. The reading results of optic density using X-RITE densitometer were converted to dose refering the characteristic curve graph of Gafchromic EBT2 that had been prepared. Characteristic curve of the film have been made by giving 25cGy, 50cGy, 100cGy, 150cGy, 200cGy, 250cGy and 300cGy of dose to film strip in 2,5x3cm2 of field. The result of this research showed that in 5cm, 6cm, 7cm, 8cm and 9cm of the depth, can be obtained transmission factors 0.954, 0.952, 0.951, 0.950 and 0.948. A great transmission factor change occured at the gantry angle position at 100o to 120o. Carbon fiber application for the surface dose increased the relative dose from 10.9% into 37.4% (6x6cm2), 16.9% into 48.39% (8x8cm2), 23.0% into 63.3% (10x10cm2), 29.2% into 75.4% (12x12cm2), 33.3% into 80.1% (14x14cm2), 37% into 86.9% (16x16cm2) and 43.3% into 91.2% (18x18cm2).
Authors and Affiliations
Muhtarom M, Eko Hidayanto, Heri Sutanto
Keywords
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