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Hakoda, Teruyuki
Hoshasen To Sangyo, (106), p.4 - 8, 2005/06
no abstracts in English
-type 4
- and 6-SiC; Identification of 
symmetry and silicon sitesMizuochi, Norikazu*; Yamasaki, Satoshi*; Takizawa, Haruki; Morishita, Norio; Oshima, Takeshi; Ito, Hisayoshi; Isoya, Junichi*
Physical Review B, 68(16), p.165206_1 - 165206_11, 2003/10
Times Cited Count：41 Percentile：82.89(Materials Science, Multidisciplinary)Isolated silicon vacancies with negative charge (V
) in 4H- and 6H-SiC were studied using EPR. The samples used in this study were irradiated with electron at 3 MeV at RT. After irradiation, the samples were annealed at 300 
C in Ar to eliminate C-related isolated vacancies. As the result of 
C hyperfine spectra, two kinds of V(I) and V(II) were distinguished and they are assigned to be arising from hexagonal and cubic sites of Si. In addition, both V(I) and V(II) signals have C symmetry, which means nearest-neighbor carbon atoms silightly distorted from a regular tetrahedron.
Hakoda, Teruyuki; Kim, H.*; Okuyama, Kikuo*; Kojima, Takuji
Journal of Aerosol Science, 34(8), p.977 - 991, 2003/08
Times Cited Count：15 Percentile：54.94(Engineering, Chemical)no abstracts in English
Yagyu, Junichi; Goto, Yoshitaka*; Arai, Takashi; Miya, Naoyuki; Morimoto, Yasutomi*; Okuno, Kenji*; Oya, Yasuhisa*; Hirohata, Yuko*; Tanabe, Tetsuo*
Heisei-15-Nendo Kiki, Bunseki Gijutsu Kenkyukai Hokoku, p.105 - 108, 2003/00
no abstracts in English
Tachibana, Haruo; Yamaguchi, Takenori; Matsuoka, Shungo*; Nemoto, Shintaro*; Kurosawa, Naohiro*
Proceedings of 1st Asian and Oceanic Congress for Radiation Protection (AOCRP-1) (CD-ROM), 7 Pages, 2002/10
An environmental radiation monitoring system in Tokai establishment of JAERI is composed of 14 monitoring posts, 4 monitoring stations, 2 drainage monitors and the monitoring data observation center. These monitoring posts and stations measure the gamma dose rate, and the monitoring stations measure the radioactive air concentration too. Drainage monitors measure the radioactive concentration in drain water. We developed the environmental radiation dose information system used by cellular phone for observing the monitoring data in day and night, working day and holiday at everyplace in Japan. This information system shows us the every minute or every 10 minutes monitoring data table and data trend graph on the cellular phone display. In the emergency situation, this system helps for speedy response such as the notification to the JAERI staffs, starting the emergency environmental monitoring activities, reporting the dose rate and concentration to the national and local authorities, and establishment of the emergency response team in JAERI.
Kishimoto, Maki; Nakamura, Tatsuya; To, Kentaro; Sakasai, Kaoru; Katagiri, Masaki; Takahashi, Hiroyuki*; Nakazawa, Masaharu*
Nihon Genshiryoku Gakkai-Shi, 43(2), p.168 - 181, 2001/02
Times Cited Count：1 Percentile：12.01(Nuclear Science & Technology)no abstracts in English
-ray irradiation*; Takada, Junichi
Earozoru Kenkyu, 12(1), p.50 - 56, 1997/00
no abstracts in English
Nishio, Gunji; Takada, Junichi; *; Murata, Mikio; Abe, Hitoshi; *
JAERI-Research 95-064, 45 Pages, 1995/09
JAERI-Research-95-064.pdf:1.61MB
no abstracts in English
; *;
Seni Gakkai-Shi, 35(2), p.80 - 89, 1979/00
no abstracts in English
Yamaguchi, Koichi; Takehisa, Masaaki
JAERI-M 5524, 32 Pages, 1974/01
no abstracts in English
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.
