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KMID : 1151820210150070949
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Journal of the Korean Society of Radiology
2021 Volume.15 No. 7 p.949 ~ p.956
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Evaluation of the Usefulness of Tungsten Nanoparticles as an Alternative to Lead Shielding Materials in Electron Beam Therapy
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Kim Ji-Hyang
Kim Na-Kyoung
Lee Gyu-Yeong
Jung Da-Bin
Heo Yeong-Cheol
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Abstract
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The purpose of this paper is to evaluate whether tungsten nanoparticles have a shielding effect on scattered light generated at high doses as an alternative material to lead used to shield scattered light in electron beam therapy. A plate was manufactured to set the position of the dosimeter and the size of the radiation field to be constant. The glass dosimeter was placed at 12 points, which were 1, 2, and 4 cm apart from the center of the field of 10 × 10 cm2 in the cross direction. A total of 12 types of tungsten nanoparticle shields were developed with a thickness of 0.75 mm to 4.00 mm and a size of 10 × 10 cm2 using 0.4, 0.75, and 1 mm materials. Using a linear accelerator, measurements were made four times at 6 MeV and four times at 12 MeV, and the dose intensity was investigated at 100 MU. The 4 mm shielding plate showed the highest shielding effect at 1 cm from the irradiation field. The 1 mm shielding plate at 2 cm from the irradiation field had the lowest shielding effect. As the thickness of the tungsten shielding plate increased, the electron beam's shielding effect increased sharply. It was confirmed that tungsten nanoparticles can reduce the amount of scattered light generated by electron beam therapy. Therefore, this study will provide basic data when follow-up studies are conducted on the shielding ability of tungsten nanoparticles.
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KEYWORD
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electron beam therapy , scattered radiation , lead , tungsten nanoparticles , glass dosimeter
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