ABSTRACT At Japan Atomic Energy Agency (JAEA) MOX fuel facilities, a worker usually wears a protective lead apron; therefore, the dose to the lens of the eye (lens dose) outside the apron is higher than that to the torso. To estimate the potential impact on the current facility operation of the International Commission of Radiological Protection (ICRP)-proposed lens dose limit reduction from 150 mSv/y to average 20 mSv/y, the authors carried out an analysis on the past dose records for the workers over the last 18 years. Of a total of 4,312 workers’ records analyzed, two workers’ annual lens doses exceeded the lowered limit of 20 mSv (23.3 mSv and 20.7 mSv), although the maximum effective dose was below 10 mSv in each case. These compiled dose data reveal that in the glovebox and related operations the lens dose will be a limiting factor in radiological control under the newly lowered dose limit. To ensure that the number of workers with an annual lens dose greater than 15 mSv (approximately 0.6% of the workers) is kept to a minimum, the implementation of an administrative control level for the lens dose is considered.

中文翻译：

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JAEA MOX 燃料设施眼晶状体剂量学的现状和实际问题

摘要 在日本原子能厅 (JAEA) 的 MOX 燃料设施中，工人通常穿着铅防护围裙；因此，围裙外眼睛晶状体的剂量（晶状体剂量）高于躯干。为了估计国际放射防护委员会 (ICRP) 提议的镜片剂量限制从 150 mSv/y 降低到平均 20 mSv/y 对当前设施运行的潜在影响，作者对过去的剂量记录进行了分析过去 18 年的工人。在分析的总共 4,312 份工人记录中，两名工人的镜片年剂量超过了 20 毫希沃特的下限（23.3 毫希沃特和 20.7 毫希沃特），尽管在每种情况下最大有效剂量都低于 10 毫希沃特。这些汇编的剂量数据表明，在新降低的剂量限制下，在手套箱和相关操作中，镜片剂量将成为放射学控制的限制因素。为确保将镜片年剂量大于 15 毫希沃特的工人数量（约占工人的 0.6%）保持在最低限度，考虑对镜片剂量实施行政控制水平。