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KMID : 1151820220160030257
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Journal of the Korean Society of Radiology
2022 Volume.16 No. 3 p.257 ~ p.263
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Fabrication and Evaluation of Mercury(II) Iodide Unit Cell Dosimeter to Confirm the Feasibility of Digital Quality Assurance in Intracavitary Radiotherapy
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Jung Jae-Hoon
Park Sung-Kwang
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Abstract
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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.
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KEYWORD
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Semiconductor, HgI2, Dosimeter, Intracavitary radiotherapy
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