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Tang, J.*; Seo, O.*; Rivera Rocabado, D. S.*; Koitaya, Takanori*; Yamamoto, Susumu*; Namba, Yusuke*; Song, C.*; Kim, J.*; Yoshigoe, Akitaka; Koyama, Michihisa*; et al.
Applied Surface Science, 587, p.152797_1 - 152797_8, 2022/06
Times Cited Count：7 Percentile：77.62(Chemistry, Physical)The hydrogen absorption and diffusion mechanisms on cube-shaped Pd nanoparticles (NPs) which are important hydrogen-storage materials were studied using X-ray photoelectron spectroscopy and DFT calculations. In the surface region, hydrogen absorption showed almost similar behavior regardless of the NPs size. It was found that the octahedral sites are more favorable than the tetrahedral sites for hydrogen occupation. We also clarified that the hydrogen atoms absorbing on the smaller-sized Pd NPs diffuse to the subsurface more actively because of the weakened Pd-H bond by the surface disordering, which plays an important role in hydrogen adsorption at a low H
pressure.
Kimata, Tetsuya*; Kakitani, Kenta*; Yamamoto, Shunya*; Shimoyama, Iwao; Matsumura, Daiju; Iwase, Akihiro*; Mao, W.*; Kobayashi, Tomohiro*; Yamaki, Tetsuya*; Terai, Takayuki*
Physical Review Materials (Internet), 6(3), p.035801_1 - 035801_7, 2022/03
Times Cited Count：7 Percentile：71.37(Materials Science, Multidisciplinary)Yoshigoe, Akitaka; Shiwaku, Hideaki; Kobayashi, Toru; Shimoyama, Iwao; Matsumura, Daiju; Tsuji, Takuya; Nishihata, Yasuo; Kogure, Toshihiro*; Okochi, Takuo*; Yasui, Akira*; et al.
Applied Physics Letters, 112(2), p.021603_1 - 021603_5, 2018/01
Times Cited Count：6 Percentile：34.59(Physics, Applied)A synchrotron radiation photoemission electron microscope (SR-PEEM) was applied to demonstrate pinpoint analysis of micrometer-sized weathered biotite clay particles with artificially adsorbed cesium (Cs) atoms. Despite the insulating properties of the clay, we observed the spatial distributions of constituent elements (Si, Al, Cs, Mg, Fe) without charging issues. We found that Cs atoms were likely to be adsorbed evenly over the entire particle. Spatially-resolved X-ray absorption spectra (XAS) of the Cs M
-edge region showed Cs to be present in a monocation state (Cs
). Further pinpoint XAS measurements were also performed at the Fe L
-edge to determine the chemical valence of the Fe atoms. Our results demonstrate the utility of SR-PEEM as a tool for spatially-resolved chemical analyses of various environmental substances, which is not limited by the poor conductivity of samples.
Tsuda, Shuichi; Yoshida, Tadayoshi; Nakahara, Yukio; Sato, Tetsuro; Seki, Akiyuki; Matsuda, Norihiro; Ando, Masaki; Takemiya, Hiroshi; Tanigaki, Minoru*; Takamiya, Koichi*; et al.
JAEA-Technology 2013-037, 54 Pages, 2013/10
JAEA-Technology-2013-037.pdf:4.94MB
JAEA has been performing dose rate mapping in air using a car-borne survey system KURAMA-II. The KURAMA system is a GPS-aided mobile radiation monitoring system that has been newly developed by Kyoto University Research Reactor Institute in response to the nuclear disaster. The KURAMA system is composed of an energy-compensated scintillation survey meter for measuring dose rate, electric device for controlling both the dose rates and the position data from a GPS module, a computer server for processing and analyzing data from KURAMA, and client PCs for providing for end users. The KURAMA-II has been improved in small-packaging, durability, and automated data transmission. In consequence, dose rate mapping in wide area has become possible in shorter period of time. This report describes the construction of KURAMA-II, its application and a suggestion of how to manage a large number of KURAMA-II.
Matsuda, Iwao*; Nakamura, Fumitaka*; Kubo, Keisuke*; Hirahara, Toru*; Yamazaki, Shiro*; Choi, W. H.*; Yeom, H. W.*; Narita, Hisashi*; Fukaya, Yuki; Hashimoto, Mie*; et al.
Physical Review B, 82(16), p.165330_1 - 165330_6, 2010/10
Times Cited Count：9 Percentile：40.66(Materials Science, Multidisciplinary)no abstracts in English
rodsMiyoshi, Yoshinori; Nakajima, Ken; ; Kobayashi, Iwao; Aoki, Shigeaki*; *; *; *
Journal of Nuclear Science and Technology, 31(4), p.335 - 348, 1994/04
Times Cited Count：1 Percentile：17.88(Nuclear Science & Technology)no abstracts in English
Murakami, Kiyonobu; Kobayashi, Iwao
JAERI-M 93-179, 107 Pages, 1993/09
no abstracts in English
cores with soluble poisonsMiyoshi, Yoshinori; Yamamoto, Toshihiro; Suzaki, Takenori; Kobayashi, Iwao
Journal of Nuclear Science and Technology, 29(12), p.1201 - 1211, 1992/12
no abstracts in English
coresMiyoshi, Yoshinori; Nakajima, Ken; Kobayashi, Iwao; Aoki, Shigeaki*; *
Transactions of the American Nuclear Society, 66, p.287 - 288, 1992/11
no abstracts in English
Nishina, Kojiro*; Yamane, Yoshihiro*; Kobayashi, Iwao; Tachimori, Shoichi; ; Miyoshi, Yoshinori; Okuno, Hiroshi; Nakajima, Ken; Mitake, Susumu*; *; et al.
Nihon Genshiryoku Gakkai-Shi, 34(4), p.311 - 319, 1992/04
Times Cited Count：0 Percentile：0.49(Nuclear Science & Technology)no abstracts in English
Kobayashi, Iwao; Takeshita, Isao; Yanagisawa, Hiroshi; Tsujino, Takeshi
Proc. of the 91 Int. Conf. on Nuclear Criticality Safety,Vol. 1, p.I-9 - I-18, 1991/00
no abstracts in English
Miyoshi, Yoshinori; Suzaki, Takenori; ; Kobayashi, Iwao
JAERI-M 90-112, 45 Pages, 1990/07
no abstracts in English
Sakurai, Satoshi; Hirata, Masaru; ; Usuda, Shigekazu; Abe, Jiro; ; Tachimori, Shoichi; ; Kurihara, Masayoshi; Kobayashi, Iwao
JAERI-M 90-059, 35 Pages, 1990/03
no abstracts in English
Miyoshi, Yoshinori; Takeshita, Isao; Kobayashi, Iwao
Nihon Genshiryoku Gakkai-Shi, 31(5), p.536 - 538, 1989/05
no abstracts in English
Suzaki, Takenori; Yanagisawa, Hiroshi; Kobayashi, Iwao
Proc. of the Int. Topical Meeting on Safety Margins in Criticality Safety, p.112 - 119, 1989/00
no abstracts in English
Murakami, Kiyonobu; Kobayashi, Iwao
JAERI-M 88-128, 18 Pages, 1988/07
no abstracts in English
Miyoshi, Yoshinori; Yanagisawa, Hiroshi; Suzaki, Takenori; Kobayashi, Iwao
Proc. ANS Int. Reactor Physics Conf., Vol. 2, p.493 - 503, 1988/00
no abstracts in English
Hirao, Norie; Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Okamoto, Yoshihiro; Suzuki, Shinichi; Yaita, Tsuyoshi; Usami, Noriko*; Kobayashi, Katsumi*
no journal, ,
We report here the facility of radioactive materials beamline at KEK (High Energy Accelerator Research Organization). The beamline was designed and built by Japan Atomic Energy Agency (JAEA). The experimental stations of BL-27 are located inside the "hot" laboratory where radioactive materials or samples including U or Th can be handled, in order to irradiate these samples with synchrotron X-rays. The beamline is divided into two branch lines; one is BL-27A for soft X-rays (1.8 to 6 keV) and the other is BL-27B for X-rays (4 to 20 keV). In BL-27A, irradiation apparatuses for radiobiology, photoelectron spectrometer (XPS) and photoelectron emission microscopy (PEEM) are installed in tandem. In BL-27B, irradiation apparatuses for radiobiology and XAFS spectrometer are inside hatch. This beamline is equipped with XAFS experiments (transmission XAFS, fluorescent XAFS and Imaging XAFS).
Shiwaku, Hideaki; Yaita, Tsuyoshi; Suzuki, Shinichi; Kobayashi, Toru; Miyazaki, Yuji; Awual, M. R.; Motokawa, Ryuhei; Okamoto, Yoshihiro; Matsumura, Daiju; Yoshii, Kenji; et al.
no journal, ,
no abstracts in English
Yoshigoe, Akitaka; Shiwaku, Hideaki; Kobayashi, Toru; Shimoyama, Iwao; Matsumura, Daiju; Tsuji, Takuya; Nishihata, Yasuo; Yaita, Tsuyoshi; Kogure, Toshihiro*; Motai, Satoko*; et al.
no journal, ,
Fundamental researches on adsorption state of radiaoactive Cs in clay mineral (aluminosilicate) have become important from the virewpoints of development of decontamination or volume-reduction techniques since the accident of Fukushima Daiiichi Nuclear Power Station. Pinpoint surface chemical analysis with nanometer spatial resolutions focusing on a target sample has been needed. In this presentation, I will show our recent work on nanoscale pinpoint surface chemical analysis for Cs-containing clay mineral by means of synchrotron radiation PEEM at BL17SU in SPring-8.
