2004 Fiscal Year Final Research Report Summary
STUDY ON DEVELOPMENT OF MONITORING OF RADIOACTIVE NOVLE NOBLE GASES
| Project/Area Number |
14380236
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
MUNAKATA Kenzo KYUSHU UNIVERSITY, Interdisciplinary Graduate School of Engineering Science, Associate Professor, 大学院・総合理工学研究院, 助教授 (70264067)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Radioactive noble gas / Adsorption / Krypton / Xenon / Measurement system / Numerical simulation / Design / Monitoring |
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| Research Abstract |
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
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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
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