辐射防护2025，Vol.45Issue(4)：320-326,7.
眼晶体当量剂量计算模型的建立与光子剂量转换系数Hlens/Ka计算
Development of detailed human eye model and dose conversion coefficients for monoenergetic photon
摘要
Abstract
Based on medical anatomy,radiation dosimetry and characteristic physical parameters of Chinese adults,a detailed model for equivalent dose of the eye lens was established.The model consists of two parts:binocular eyeball and head phantom;The model consists of two parts:binocular eyeball and head;the eyeball possesses a detailed anatomical structure consisting of 8 tissues,and the head is composed of soft tissue and hard bone;The left and right eyeballs are symmetrically placed inside the head model.By employing this model,the equivalent dose of the eye lens and the conversion coefficient Hlens/Kawere computed when the 0.01-10 MeV monoenergetic parallel photon beam was irradiated at 0°,90°,and 180°.The results showed that the Hlens/Ka of photons which energy is less 40 keV at 0° and 90° incidence reported by ICRP 74 was 1.04-4.78 times higher than that of the proposed paper,mainly due to the increase of cornea and anterior chamber in the proposed model.Hlens/Ka of ICRP 110 reported was 0.43,0.93 and 1.45-1.65 times higher than that in this paper of 10 keV,20 keV and 3-10 MeV irradiated at 0°,and the model in this paper improved the underestimation and overestimation of the dose caused by the excessive thickness of the anterior tissue of the ocular lens in the ICRP 110 report.The Hlens/Ka of the Behrens model when irradiated with 30-60 keV and 100 keV-10 MeV photons at 180° was 4.05-1.18 and 0.86-0.92 times of that in this paper,the difference was that the head phantom was determined to be an elliptical cylinder with a skull reference to the human body size of Chinese adults.And the ratio of the binocular eye lenses was 130％-710％when irradiated at 90° by 20 keV-1 MeV photons,this indicates that special attention should be paid to the radiation risk caused by the non-uniform irradiation.关键词
辐射剂量/外照射/眼晶体/蒙特卡罗Key words
radiation dose/external exposure/lens of eye/Monte Carlo分类
能源科技引用本文复制引用
卫晓峰,王川,刘立业,李晓敦,曹勤剑,赵原,焦岩..眼晶体当量剂量计算模型的建立与光子剂量转换系数Hlens/Ka计算[J].辐射防护,2025,45(4):320-326,7.基金项目
国家自然科学基金(U216720021)精细化外照射人体剂量实时计算方法研究项目资助. （U216720021）
