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Elucidation of the reduction of uranium in biotite by advanced X-ray spectroscopy

Yomogida, Takumi   ; Yamada, Shinya*; Ichinohe, Yuto*; Sato, Toshiki*; Hayakawa, Ryota*; Okada, Shinji*; Toyama, Yuichi*; Hashimoto, Tadashi   ; Noda, Hirofumi*; Isobe, Tadaaki*; Okumura, Takuma*; Takatori, Sayuri*; Hiraki, Takahiro*; Tatsuno, Hideyuki*; Sekizawa, Oki*; Nitta, Kiyofumi*; Higashi, Kotaro*; Kurihara, Yuichi*; Kawamura, Naomi*; Uruga, Tomoya*; Kitatsuji, Yoshihiro  ; Takahashi, Yoshio*

The reduction of uranium on biotite was studied to obtain insight into the immobilization of uranium in the environment. The chemical species of uranium in biotite were studied using a superconducting transition edge sensor and an X-ray emission spectrometer to remove interference from rubidium in biotite. As a result, the speciation of uranium in biotite collected from former uranium deposits was possible. The XANES spectra of the biotite indicated that the uranium in the biotite was partially reduced.

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