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KMID : 1151820210150060789
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Journal of the Korean Society of Radiology
2021 Volume.15 No. 6 p.789 ~ p.794
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The Study on Applicability of Manufactured Lead(II) Iodide Dosimeter for Dose Measurement in Brachytherapy
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Yang Seung-Woo
Han Moo-Jae
Park Sung-Kwang
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Abstract
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Brachytherapy is a treatment in which radioactive isotopes are placed inside the body to intensively irradiate the tumor with radiation. Because brachytherapy uses a radioisotope source with a high dose rate, it is very important to know the exact location and dose of the source. However, in clinical practice, it is evaluated inaccurately with the naked eye through rulers and autoradiographs. Therefore, in this study, a dosimeter that can be used for brachytherapy was developed using a lead(II) iodide (PbI2) material, and the applicability was evaluated by analyzing the reproducibility, linearity, and PID items. As a result of reproducibility evaluation, the RSD value was 1.41%, satisfying the evaluation criteria of 1.5%. As a result of the linearity evaluation, the R2 value was 0.9993, which satisfies the evaluation criterion of 0.9990. As a result of PID evaluation, it showed only a difference of 0.06 cm compared with the theoretical value of the inverse square law of distance at the 50% dose reduction point. The dosimeter manufactured in this experiment shows results that satisfy the standard in all evaluations, so it is judged that the possibility of applying the dosimeter in the radiation brachytherapy area is sufficient.
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KEYWORD
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brachytherapy , dosimeter , quality assurance , lead(II) iodide
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