Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France.
University of Glasgow, Glasgow, United Kingdom.
J Radiol Prot. 2022 Jul 6;42(3). doi: 10.1088/1361-6498/ac758f.
The lens of the eye can be damaged by ionising radiation, so individuals whose eyes are exposed to radiation during their work may need to protect their eyes from exposure. Lead glasses are widely available, but there are questions about their efficiency in providing eye protection. In this study, Monte Carlo simulations are used to assess the efficiency of lead glasses in protecting the sensitive volume of the eye lens. Two designs currently available for interventional cardiologists are a wraparound (WA) style and ones with flat frontal lenses with side shielding. These designs were considered together with four modifications that would impact upon their efficiency: changing the lead equivalent thickness, adding lead to the frames, elongating the frontal lenses, and adding a closing shield to the bottom rim. For the eye closest to the source, standard models of lead glasses only decrease the radiation reaching the most sensitive region of the eye lens by 22% or less. Varying the lead thickness between 0.4 mm and 0.75 mm had little influence on the protection provided in the simulation of clinical use, neither did adding lead to the frames. Improved shielding was obtained by elongating the frontal lens, which could reduce radiation reaching the eye lens by up to 76%. Glasses with lenses that had a rim at the base, extending towards the face of the user, also provided better shielding than current models, decreasing the dose by up to 80%. In conclusion, elongating the frontal lens of lead glasses, especially of the WA design, could provide a three-fold increase in shielding efficiency and this is still valid for lenses with 0.4 mm lead equivalence.
眼睛的晶状体可能会受到电离辐射的损害，因此，在工作中眼睛暴露于辐射下的个体可能需要保护眼睛免受辐射。铅眼镜广泛可用，但关于它们在提供眼部保护方面的效率存在一些问题。在这项研究中，使用蒙特卡罗模拟来评估铅眼镜在保护眼晶状体敏感体积方面的效率。目前可供介入心脏病学家使用的两种设计是全包式（WA）风格和带有平面前镜头和侧面屏蔽的设计。这些设计与四个可能影响其效率的修改一起考虑：改变铅当量厚度，向镜框添加铅，延长前镜头以及在底部边缘添加封闭屏蔽。对于最接近源的眼睛，标准铅眼镜模型仅将到达眼晶状体最敏感区域的辐射减少 22%或更少。在临床使用模拟中，在 0.4 毫米至 0.75 毫米之间变化铅厚度对提供的保护几乎没有影响，向镜框添加铅也没有影响。通过延长前镜头，可以获得更好的屏蔽效果，这可以将到达眼晶状体的辐射减少多达 76%。具有底部边缘延伸到使用者脸部的镜片的眼镜也比现有模型提供了更好的屏蔽效果，最大减少 80%的剂量。总之，延长铅眼镜的前镜头，尤其是 WA 设计，可以将屏蔽效率提高三倍，对于 0.4 毫米铅当量的镜头仍然有效。
