A dosimetry method in the transverse plane of HDR Ir-192 brachytherapy source using gafchromic EBT2 film |
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| Authors: | SC Uniyal SD Sharma UC Naithani |
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| Institution: | 1. Department of Radiology, Himalayan Institute of Medical Sciences, Jolly Grant, Dehradun 248140, India;2. Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, CT&CRS Building, Anushaktinagar, Mumbai 400094, India;3. Department of Physics, HNB Garhwal Central University, Campus Pauri, Pauri (Garhwal), Uttarakhand 246001, India;1. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany;2. Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, D-60438 Frankfurt am Main, Germany;1. Institute of Optical Information, School of Science, Beijing Jiaotong University, Beijing 100044, China;2. State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;1. Department of Oral and Maxillofacial Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea;2. Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Seoul, Republic of Korea;1. Nuclear Research Center Negev, Beersheva, Israel;2. Ben Gurion University of the Negev, Beersheva, Israel;3. Soreq Nuclear Research Center, Yavne 81800, Israel;4. Sami Shamoon College of Engineering, Beersheva 84100, Israel |
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| Abstract: | Radiochromic film dosimetry is increasingly used in brachytherapy applications for its higher resolution ability as compared to other experimental methods. The present study was aimed to assess the accuracy and suitability of use of the improved radiochromic film model, Gafchromic EBT2, to evaluate the dose distribution in the transverse plane of microselectron HDR 192Ir source.A specially designed and locally fabricated Polymethyl methacrylate (PMMA) phantom was used in this work for the experimental measurement of dose distribution around the source in its transverse plane. The AAPM TG-43U1 recommended radial dose function, g (r), and dose rate constant, Λ, for the source were measured using Gafchromic EBT2 film and thermoluminescent dosimeters (TLD). The EBT2 film measured dosimetric quantities were validated against their values obtained from the TLD measurements and previously published values for the same source available in literature.The dose rate constant and radial dose function for microselectron HDR 192Ir source obtained from Gafchromic EBT2 film measurements are in agreement with their TLD measured results within 3.9% and 2.8% respectively. They also agree within the accepted range of uncertainty with their experimental and Monte Carlo calculated results reported in literature.This work demonstrates the suitability of using Gafchromic EBT2 film dosimetry in characterization of dose distribution in the transverse plane of HDR Ir-192 source. This is a more efficient method than TLD dosimetry at discrete and distant positions. Relative to TLD dosimetry, it is found to be better reproducible, easy to use and a less expensive method of dosimetry. |
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