光学隐形眼镜中238U、232Th、222Rn和220Rn含量的测量:成年患者眼组织的α和β等效剂量。

IF 1 4区 医学 Q4 ENVIRONMENTAL SCIENCES
Health physics Pub Date : 2024-02-01 Epub Date: 2023-10-18 DOI:10.1097/HP.0000000000001755
M A Misdaq, B Elouardi
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引用次数: 0

摘要

摘要:为了估计患者眼组织接受的等效剂量,测定了用于视力矫正的各种光学隐形眼镜内铀(238U)、钍(232Th)、氡(222Rn)和钍(220Rn)的含量。238U、232Th、222Rn和220Rn的含量分别在(3.44±0.24)mBq kg-1和(18.3±1.28)mBsq kg-1、(0.57±0.04)mBqkg-1和。根据患者角膜-眼睛表面、光学隐形眼镜内的238U、232Th和222Rn浓度、发射放射性核素的半衰期和患者的暴露时间,已经开发出新的外部剂量测定模型。已经表明,由所研究的光学透镜内的238U和232Th系列发射的α粒子基本上将其能量转移到角膜组织,而发射的β粒子可能到达患者眼睛的晶状体并在晶状体中失去能量。确定了由于所考虑的光学镜片中存在的222Rn和220Rn气体的扩散而导致的患者眼睛组织所接受的α当量剂量。佩戴光学隐形眼镜的成年患者(每天14小时)左眼和右眼的总(α加β)等效剂量的较高值已被发现等于1.32 mSv y-1 cm-2。建议患者缩短光学隐形眼镜的佩戴时间,以降低白内障等眼病的风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurement of 238 U, 232 Th, 222 Rn and 220 Rn Contents in Optical Contact Lenses: Resulting Alpha and Beta Equivalent Doses to the Eye Tissues of Adult Patients.

Abstract: To estimate equivalent doses received by eye tissues of patients, contents of uranium ( 238 U), thorium ( 232 Th), radon ( 222 Rn), and thoron ( 220 Rn) were determined inside various optical contact lenses used for vision correction. 238 U, 232 Th, 222 Rn, and 220 Rn contents varied between (3.44 ± 0.24) mBq kg -1 and (18.3 ± 1.28) mBq kg -1 , (0.57 ± 0.04) mBq kg -1 and (3.53 ± 0.25) mBq kg -1 , (3.44 ± 0.24) mBq kg -1 and (18.3 ± 1.28) mBq kg -1 , and (0.57 ± 0.04) mBq kg -1 and (3.53 ± 0.25) mBq kg -1 , respectively. New external dosimetric models, depending on the cornea eye surface of patients, 238 U, 232 Th, and 222 Rn concentrations inside optical contact lenses, half-life of the emitting radionuclides, and exposure time of patients, have been developed. It has been shown that alpha-particles emitted by the 238 U and 232 Th series inside the studied optical lenses transfer their energies essentially to the cornea tissues whereas the emitted beta-particles may reach and lose their energies in the crystalline lens of eyes of patients. Alpha-equivalent doses received by eye tissues of patients due to the diffusion of 222 Rn and 220 Rn gases present in the considered optical lenses were determined. The higher value of the total (alpha plus beta) equivalent dose to the left and right eyes of adult patients wearing optical contact lenses (14 hours per day) has been found equal to 1.32 mSv y -1 cm - 2 . It is recommended for patients to reduce the wearing period of optical contact lenses to reduce eye disease risks such as cataract.

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来源期刊
Health physics
Health physics 医学-公共卫生、环境卫生与职业卫生
CiteScore
4.20
自引率
0.00%
发文量
324
审稿时长
3-8 weeks
期刊介绍: Health Physics, first published in 1958, provides the latest research to a wide variety of radiation safety professionals including health physicists, nuclear chemists, medical physicists, and radiation safety officers with interests in nuclear and radiation science. The Journal allows professionals in these and other disciplines in science and engineering to stay on the cutting edge of scientific and technological advances in the field of radiation safety. The Journal publishes original papers, technical notes, articles on advances in practical applications, editorials, and correspondence. Journal articles report on the latest findings in theoretical, practical, and applied disciplines of epidemiology and radiation effects, radiation biology and radiation science, radiation ecology, and related fields.
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