STUDY ON DEVELOPMENT OF MONITORING OF RADIOACTIVE NOVLE NOBLE GASES

为国际监督核试验、防止核恐怖主义、和平利用核能，有必要发展放射性惰性气体监测系统。本研究对监测系统中的关键技术--放射性惰性气体的生糖吸附分离技术进行了研究。FAST，VIE详细研究了不受主体气体影响的惰性气体的吸附特性，了解了吸附等温线和传质机理等基本吸附特性。在此背景下，接下来，我们在氮气气氛中进行了87K下低温吸附用吸附剂的筛选试验，结果表明碳基吸附剂适用于超低温吸附氪。研究还发现，由于…的存在，氪在非碳基吸附剂上的吸附量大大减少。更多的氮气。因此，我们对氪在活性碳(Merck Inc.)、活性碳(Kishida Kagaku Inc.)、Ambersorb 572和Ryujyo Shirasagi等碳基吸附剂上的吸附特性进行了更详细的研究。通过对实验结果的分析，量化了吸附等温线和吸附速率，结果表明Ambersorb 572的吸附容量和吸附速率性能最好。对气象研究所使用的监测系统的真实吸附床进行了数值模拟，使用获得的结果对活性碳(Merck Inc.)进行了模拟。结果表明，如果吸附剂的温度保持在80~100K，目前的吸附剂用量可以在收集期间100%地回收大气中的氪。此外，还发现，如果吸附床在低温下持续运行而没有系统故障，使用Ambersorb 572吸附剂可以进一步缩小监测系统的规模。还在干冰温度下进行了筛选试验，以寻找合适的吸附剂来吸附氙气。结果表明，银-现代沸石吸附剂是一种较好的吸附氙气的吸附剂。较少

It is necessary to develop the monitoring system of radioactive noble gases for internatnnal supervision of nuclear tests, prevention of nuclear terrorism and peaceful utilization of nuclear energy. In this study ; we investigated the technology of glycogenic adsorption and separation technology of radioactive noble gases that are the key technologies for the monitoring system. Fast, vie investigated the adsorption characteristics of noble gases without the influence of bulk gas in detail, and the basic adsorption characteristics such as adsorption isotherm and mass transfer mechanisaa were understood. With this background, next, we carried out a screening test of adsorbents for cryogenic adsorption under nitrogen atmosphere at the temperature of 87 K. The result indicates that carbon-based adsorbents are suitable far cryogenic adsorption of krypton. It was also found that the adsorption amounts of krypton on non carbon-based adsorbents are considerably decreased due to the presence of … More nitrogen. Consequently, we conducted more detailed study of adsorption characteristics of krypton on carbon based adsorbents such as activated charcoal (Merck Inc), activated charcoal (kishida Kagaku Inc.), Ambersorb 572 and Ryujyo Shirasagi. Adsorption isotherms and adsorption rates were quantified by analyzing experimental results As a result, the Ambersorb 572 adsorbent was found to have the best performance with regard to adsorption capacity and adsorption rate. Numerical simulations for the real adsorption bed of the monitoring system used in Meteorogical Research Institute were performed using the results obtained for the activated charcoal (Merck Inc.). The result suggests that the present amount of the adsorbent allows 100 % recovery of atomospheric krypton during the collecting period if the temperature of the adsorbent is kept at 80〜100 K. Additionally, it was also, found that further downsizing of the monitoring system is possible by using the Ambersorb 572 adsorbent if the adsorption bed is consistently operated at cryogenic temperatures without system malfunctions. A screening test was also conducted at dry ice temperature to find suitable adsorbents for adsorption of xenon. The result reveal that an Ag-modernite adsorbent is a proper adsorbent for the adsorption of xenon. Less