1988 Fiscal Year Final Research Report Summary
An Application of the Photochemistry of Uranyl Ion to Nuclear Fuel Reprocessing
| Project/Area Number |
62580174
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Nuclear engineering
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| Research Institution | University of Tokyo |
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Principal Investigator |
KATSUMURA Yosuke Department of Nuclear Engineering, Faculty of Engineering, University of Yokyo, 工学部原子力工学科, 助教授 (70111466)
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| Co-Investigator(Kenkyū-buntansha) |
HIROISHI Daisuke Department of Nuclear Engineering, Faculty of Engineering, University of Yokyo, 工学部原子力工学科, 助手 (20199110)
SHIRAISHI Hirotsugu Department of Nuclear Engineering, Faculty of Engineering, University of Yokyo, 工学部原子力工学科, 助手 (50011200)
ISHIGURE Kenkichi Department of Nuclear Engineering, Faculty of Engineering, University of Yokyo, 工学部原子力工学科, 教授 (90010975)
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| Project Period (FY) |
1987 – 1988
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| Keywords | Uranyl ion / Photoreduction / Quantum yield / Nitric acid / Nitrous acid |
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| Research Abstract |
Photochemical reactions of uranyl ion (UO_2^<2+>) in nitric acid have been investigated from a point of applications to a spent nuclear fuel reprocessing.
Quantum yields of fluorescence from excited uranyl ion in nitric acid were determined by comparing with the photoemission of quinine in sulfuric acid taken as a refernce. It was found that the yields is an order of 10^<-3> and concentration dependence of nitric acid was measured. The emission is strongly affected by the presence of additives and quenching parameters for some additives were determined. The evaluated values were consistent with reported. Further, a simple method is proposed to evaluate the absolute concentration of uranyl ion from the quenching measurements in the presence of quenchers as impuruties.
Quantum yield of photoreduction of uranyl ion to uranous ion (U^<4+>) by ethanol in nitric acid was determined. On the basis of the concentration dependence of nitric acid and ethanol, and effects of oxygen, and concomitant ions of [H^+] and [NO^<3->], mechanism of the photochemical reactions was derived. Finally, it is concluded that photoreduction of uranyl ion by ethanol could be used for developing new techniques of the nuclear fuel reprocessing.
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