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Sato, Tsutomu
Sumekutaito Kenkyukai Kaihou, 7(2), p.39 - 41, 1997/00
no abstracts in English
Murakami, Takashi*; Isobe, Hiroshi; Sato, Tsutomu; Onuki, Toshihiko
Clays and Clay Minerals, 44(2), p.244 - 256, 1996/00
Times Cited Count：55 Percentile：84.43(Chemistry, Physical)no abstracts in English
Ishihara, Takehiko; *
Genshiryoku Kogyo, 8(5), 53 Pages, 1962/00
no abstracts in English
Teraoka, Yuden; Iwai, Yutaro*; Okada, Ryuta; Yoshigoe, Akitaka
no journal, ,
The decontamination of 
Cs is urgently necessary, especially in Fukushima prefecture, to make volume reduction of radioactive waste. In order to develop volume reduction techniques, chemical bonding states of Cs adsorbed in clay minerals, e.g. vermiculite, has been studied by using synchrotron radiation X-ray photoemission spectroscopy (SR-XPS). In this presentation, an interpretation of data obtained by surface charge modulation using an electron flood gun during SR-XPS and chemical bonding states of Cs in the vermiculite are discussed. SR-XPS experiments were conducted at the surface chemistry experimental station of BL23SU in SPring-8. The natural vermiculite was processed to adsorb Cs so that the Cs concentration was 2.1 wt%. The synchrotron radiation energy was 1486.6 eV, identical with the Al-K
line. The Auger parameter of Cs of CsClO
was closest to that of Cs-contained vermiculite, implying Cs in the vermiculite may interact with oxygen. In order to confirm it, chemical shift of Cs-3d core level was measured and four components were found. The highest binding energy component only shifted by using an electron flood gun may be originated from hydration in weathered wide crevices. The other three components not shifted as well as K atoms originally-contained between phyllosilicate layers are corresponding to covalent interaction with O and Si atoms in narrow phyllosilicate interlayers.
Teraoka, Yuden; Iwai, Yutaro*; Okada, Ryuta; Yoshigoe, Akitaka
no journal, ,
The decontamination of Cs is necessary to make volume reduction of radioactive waste. In our research group, chemical bonding states of Cs in clay minerals has been studied by synchrotron X-ray photoemission spectroscopy (SR-XPS). In this presentation, effects of surface charging via an electron flood gun during SR-XPS is discussed. All SR-XPS experiments were conducted at SUREAC2000 of BL23SU in SPring-8. The natural vermiculite produced in Fukushima prefecture, Japan was processed to adsorb Cs by dipping in a non-radioactive CsCl solution. The concentration of Cs was 2.1 wt%. The other Cs compounds, e.g. CsClO, were also used. The synchrotron radiation of 1486.6 eV, identical with the Al-K line for convenience' sake of comparison with experiments in a laboratory, was used. Sample surface charging was changed by an electron flood gun during SR-XPS. It was revealed that the Auger parameter of Cs of CsClO was closest to that of Cs-contained vermiculite, suggesting Cs atoms adsorbed in the vermiculite may also interact with O atoms contained in the vermiculite. Photoemission spectra of Cs-3d core levels were measured to find four components. The component having the highest binding energy is only shifted by the operation of flood gun, suggesting most ionic chemical bonding. Consequently, the shifted component may be originated from Cs hydrated in water of weathered wide crevice between phyllosilicate layers. The other components are corresponding to interaction with O and Si atoms in narrow phyllosilicate interlayers.
Teraoka, Yuden; Iwai, Yutaro*; Okada, Ryuta; Yoshigoe, Akitaka
no journal, ,
no abstracts in English
Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Nishitsuji, Shotaro*; Yaita, Tsuyoshi; Kobayashi, Toru; Suzuki, Shinichi
no journal, ,
no abstracts in English
Motokawa, Ryuhei; Endo, Hitoshi*
no journal, ,
no abstracts in English
