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http://dx.doi.org/10.7742/jksr.2021.15.6.781

Development and Evaluation of Silicon Passive Layer Dosimeter Based Lead-Monoxide for Measuring Skin Dose  

Yang, Seung-Woo (Department of Radiation Oncology, Collage of Medicine, Inje University)
Han, Moo-Jae (Department of Radiation Oncology, Collage of Medicine, Inje University)
Jung, Jae-Hoon (Research for Conveergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital)
Bae, Sang-Il (Department of Radiation Oncology, Dongnam Institute of Radiological and Medical Sciences)
Moon, Young-Min (Department of Radiation Oncology, Dongnam Institute of Radiological and Medical Sciences)
Park, Sung-Kwang (Department of Radiation Oncology, Busan Paik Hospital, Inje University)
Kim, Jin-Young (Department of Radiation Oncology, Dongnam Institute of Radiological and Medical Sciences)
Publication Information
Journal of the Korean Society of Radiology / v.15, no.6, 2021 , pp. 781-788 More about this Journal
Abstract
Due to the high sensitivity to radiation, excessive exposure needs to be prevented by accurately measuring the dose irradiated to the skin during radiation therapy. Although clinical trials use dosimeters such as film, OSLD, TLD, glass dosimeter, etc. to measure skin dose, these dosimeters have difficulty in accurate dosimetry on skin curves. In this study, to solve these problems, we developed a skin dosimeter that can be attached according to human flexion and evaluated its response characteristics. For the manufacture of the dosimeter, lead oxide (PbO) with high atomic number (ZPb: 82, ZO: 8) and density (9.53 g/cm3) and silicon binders that can bend according to human flexion were used. In the case of a dosimeter made of PbO material, the performance degradation has been prevented by using parylene and others due to the presence of degradation due to oxidation, but the previously used parylene is affected by bending, so a new form of passive layer was produced and applied to the skin dosimeter. The characteristic evaluation of the skin dosimeter was evaluated by analyzing SEM, reproducibility, and linearity. Through SEM analysis, bending was evaluated, reproducibility and linearity at 6 MeV energy were evaluated, and applicability was assessed with a skin dosimeter. As a result of observing the dosimeter surface through SEM analysis, the parylene passive layer PbO dosimeter with the positive layer raised to the parylene produced cracks on the surface when bent. On the other hand, no crack was observed in the silicon passive layer PbO dosimeter, which was raised to silicon passive layer. In the reproducibility measurement results, the RSD of the silicon passive layer PbO dosimeter was 1.47% which satisfied the evaluation criteria RSD 1.5% and the linearity evaluation results showed the R2 value of 0.9990, which satisfied the evaluation criteria R2 9990. The silicon passive layer PbO dosimeter was evaluated to be applicable to skin dosimeters by demonstrating high signal stability, precision, and accuracy in reproducibility and linearity, without cracking due to bending.
Keywords
Photoconductor; Lead Monoxide; Surface dose; Radiotherapy;
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