Abstract Radioactive iodine (131I) released from nuclear power plants has been a critical environmental concern for workers. The effective trapping of radioactive iodine isotopes from the off-gas stream generated from nuclear facilities is an important issue in radioactive waste treatment systems evaluation. Numerous studies on retaining methyl iodide (CH3I131) by impregnated activated carbons under the high content of moisture have been extensively studied so far. But there have been no good results on how to remove methyl iodide at high humid conditions up to now. A new challenge is to introduce other promising impregnating chemical agents that are able to uptake enough radioactive methyl iodide under high humid conditions. In order to develop a good removal efficiency to control radioiodine gas generated from a high humid process, activated carbons (ACs) impregnated with triethylene diamine (TEDA) and qinuclidine (QUID) were prepared. In addition, the removal efficiencies of the activated carbons (ACs) under humid conditions up to 95% RH were evaluated by applying the standard method specified in ASTM-D3808. Quinuclidine impregnated activated carbon showed a much higher decontamination factor above 1,000, which is enough to meet the regulation index for the iodine filters in nuclear power plants (NPPs).

中文翻译：

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高湿条件下活性炭对放射性甲基碘去污因子的评价

摘要 核电站释放的放射性碘 (131I) 一直是工人面临的重要环境问题。从核设施产生的废气流中有效捕获放射性碘同位素是放射性废物处理系统评估中的一个重要问题。迄今为止，已经对通过浸渍活性炭在高水分含量下保留甲基碘 (CH3I131) 进行了大量研究。但目前在高湿条件下如何去除碘甲烷还没有很好的结果。一个新的挑战是引入其他有前途的浸渍化学试剂，它们能够在高湿条件下吸收足够的放射性甲基碘。为了开发出良好的去除效率来控制高湿度过程中产生的放射性碘气体，制备了浸渍有三亚乙基二胺（TEDA）和七核苷（QUID）的活性炭（ACs）。此外，通过应用 ASTM-D3808 中规定的标准方法评估了在高达 95% RH 的潮湿条件下活性炭 (AC) 的去除效率。奎宁环浸渍活性炭在1000以上表现出更高的去污系数，足以满足核电厂（NPP）碘过滤器的监管指标。