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Development of Detailed Korean Adult Eye Model for Lens Dose Calculation

방사선방어학회지 2020년 45권 1호 p.45 ~ 52
한해진 ( Han Hae-Gin ) - Hanyang University Department of Nuclear Engineering

 ( Zhang Xujia ) - Hanyang University Department of Nuclear Engineering
염연수 ( Yeom Yeon-Soo ) - National Institute of Health National Cancer Institute Division of Cancer Epidemiology and Genetics
최찬수 ( Choi Chan-Soo ) - Hanyang University Department of Nuclear Engineering
 ( Nguyen Thang Tat ) - Hanoi University of Science and Technology School of Nuclear Engineering and Environmental Physics
신방호 ( Shin Bang-Ho ) - Hanyang University Department of Nuclear Engineering
하상석 ( Ha Sang-Seok ) - Hanyang University Department of Nuclear Engineering
문성호 ( Moon Sung-Ho ) - Hanyang University Department of Nuclear Engineering
김찬형 ( Kim Chan-Hyeong ) - Hanyang University Department of Nuclear Engineering

Abstract


Background: Recently, the International Commission on Radiological Protection (ICRP) lowered the dose limit for the eye lens from 150 mSv to 20 mSv, highlighting the importance of accurate lens dose estimation. The ICRP reference computational phantoms used for lens dose calculation are mostly based on the data of Caucasian population, and thus might be inappropriate for Korean population.

Materials and Methods: In the present study, a detailed Korean eye model was constructed by determining nine ocular dimensions using the data of Korean subjects. The developed eye model was then incorporated into the adult male and female mesh-type reference Korean phantoms (MRKPs), which were then used to calculate lens doses for photons and electrons in idealized irradiation geometries. The calculated lens doses were finally compared with those calculated with the ICRP mesh-type reference computational phantoms (MRCPs) to observe the effect of ethnic difference on lens dose.
Results and Discussion: The lens doses calculated with the MRKPs and the MRCPs were not much different for photons for the entire energy range considered in the present study. For electrons, the differences were generally small, but exceptionally large differences were found at a specific energy range (0.5-1 MeV), the maximum differences being about 10 times at 0.6 MeV in the anteroposterior geometry; the differences are mainly due to the difference in the depth of the lens between the MRCPs and the MRKPs.

Conclusion: The MRCPs are generally considered acceptable for lens dose calculations for Korean population, except for the electrons at the energy range of 0.5-1 MeV for which it is suggested to use the MRKPs incorporating the Korean eye model developed in the present study.

키워드

Lens Dose; Korean; Detailed Eye Model; Computational Phantom; Mesh-Type
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