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Assessing oxidation of UO$$_{2}$$ with $$mu$$-Raman spectroscopy and X-ray absorption spectroscopy

Yomogida, Takumi   ; Ouchi, Kazuki  ; Matsumura, Daiju   ; Tsuji, Takuya  ; Kobayashi, Toru ; Kitatsuji, Yoshihiro  

A combination of micro-Raman spectroscopy (MRS), and X-ray absorption spectroscopy was applied to the characterization of uranium dioxide (UO$$_{2+X}$$). A fresh UO$$_{2}$$ immediately after preparation, an aged UO$$_{2}$$ after 30 years storage were employed. In X-ray absorption near edge structure (XANES) spectra, the absorption edge of the aged UO$$_{2}$$ sample was shifted to higher energy. This result indicates that the aged UO$$_{2}$$ was slightly oxidized. Characteristic Raman bands at 447, and 1150 cm$$^{-1}$$ which derived from UO$$_{2}$$ structure were observed in both the flesh and the aged UO$$_{2}$$. The ratio of a Raman peak at 1150 cm$$^{-1}$$ to at 447 cm$$^{-1}$$ of the fresh UO$$_{2}$$ is higher than that of the aged UO$$_{2}$$. These results are showing the applicability of the proposed methods to analyzing the oxidation of UO$$_{2}$$.

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Japanese

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Meeting title

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日本放射化学会第63回討論会(2019)

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2019/09

Location (city)

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いわき

Location (country)

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日本

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Keywords

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U$$_{3}$$O$$_{8}$$; UO$$_{2}$$; 顕微ラマン分光法; X線吸収分光; 福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident

Research Facility

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第4研究棟  ;SPring-8(大型放射光施設)

Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Accesses

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- Accesses

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