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人眼晶状体是一种辐射敏感器官,建立精细的人眼模型对于精确评估晶状体的受照剂量及辐射风险非常重要。该文基于中国成年男性眼睛的特征参数建立了精细眼模型,该模型包含眼睑、巩膜、脉络膜、视网膜、晶状体、虹膜、角膜、玻璃体和房水9个主要结构。在此精细眼模型的基础上,利用MCNP模拟程序计算多种照射情形下晶状体的电子剂量转换系数,并与相关文献中的结果进行对比。结果表明:当电子能量在0.6~1.2MeV之间时,计算结果与其他文献中的结果差异较大,相对偏差最高可达98%,该模型为准确评估中国成年男性晶状体剂量提供了参考。
The human eye lens is a radiation sensitive organ and it is important to establish a fine human eye model for accurately assessing the dose and radiation exposure of the lens. In this paper, a fine eye model is established based on the characteristic parameters of Chinese adult male eyes. The model includes nine major structures of the eyelids, sclera, choroid, retina, lens, iris, cornea, vitreous and aqueous humor. Based on this fine eye model, the electron dose conversion coefficient of the lens under various irradiation conditions was calculated by MCNP simulation program and compared with the results in the related literatures. The results show that when the energy of electrons is between 0.6 and 1.2 MeV, the calculated results are quite different from the results in other literatures. The relative deviation can reach as high as 98%. This model provides a reference for accurately evaluating the dose of Chinese adult male lens.