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KMID : 1151820200140060841
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Journal of the Korean Society of Radiology
2020 Volume.14 No. 6 p.841 ~ p.848
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Evaluation of Attenuation Rate Error on Skin Dosimeter using Monte Carlo Simulation in Photon and Electron Beam Therapy
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Han Moo-Jae
Yang Seung-Woo
Heo Seung-Uk
Bae Sang-Il
Moon Young-Min
Park Sung-Kwang
Kim Jin-Young
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Abstract
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In the field of radiation therapy using photon beams and electron beams, since each patient has a different sensitivity to radiation, skin side effects may occur even at the same dose. Therefore, if there is a risk of excessive dose to the skin, a dosimeter is attached to verify whether the correct dose is being investigated. However, since the skin dosimeter checks the attachment site visually by measuring a point dose, it is difficult to confirm an accurate dose distribution. As a result, the measurement and simulation errors of the material HgI2 in the 6 MV photon beam were 3.73% and 5.24%, respectively, at the minimum thickness of 25 μm, and the material PbI2 was 4.73% and 5.65%, respectively. On the other hand, as a result of the 6 MeV electron beam, the measurement and simulation errors of the material HgI2 were 1.35% and 1.12%, respectively, at a minimum thickness of 25 μm, and the material PbI2 showed relatively low attenuation error, 1.67% and 1.20%, respectively. Therefore, it was evaluated that the thickness of the photon beam within 25 μm and the electron beam within 100 μm is suitable to have a reduction rate error within 5%. This study presents a new research direction for a flexible dosimeter attached to the human body that is required in clinical practice and the construction conditions of a future skin dosimeter.
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KEYWORD
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Attenuation rate, Flexible, Skin dose, Photon, Electron
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