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http://dx.doi.org/10.7742/jksr.2022.16.3.257

Fabrication and Evaluation of Mercury(II) Iodide Unit Cell Dosimeter to Confirm the Feasibility of Digital Quality Assurance in Intracavitary Radiotherapy  

Jung, Jae-Hoon (Department of Research Institute for Convergence of Biomedical science and technology, Yangsan Hospital, Pusan National University)
Park, Sung-Kwang (Department of Radiation Oncology, Busan Paik Hospital, Inje University)
Publication Information
Journal of the Korean Society of Radiology / v.16, no.3, 2022 , pp. 257-263 More about this Journal
Abstract
In intracavitary radiotherapy, it is essential to verify the correct location of radiation source among quality control items because an incorrect location will irradiate an unnecessary dose to normal tissues. As a basic study of digital line dosimeters, this study fabricated a unit cell dosimeter based on polycrystalline mercury (II) iodide (HgI2) and compared its performance with a diode. The study result showed that for reproducibility, the relative standard deviation (RSD) was 1.21%, satisfying the RSD evaluation criterion of within 1.5%. Considering linearity, the coefficient of determination R2 showed an excellent result of 0.9997. Regarding the evaluation of distance dependence, it showed a similar trend in general with a difference of 0.035 cm for intensity 50% when compared with the inverse square value. This study suggests the applicability of a digital dosimeter for brachytherapy quality control by evaluating the performance of the HgI2 dosimeter. This study on dosimeter for candidate photoconductor materials can be used as basic data in all areas using radiation.
Keywords
Semiconductor; $HgI_2$; Dosimeter; Intracavitary radiotherapy;
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