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Journal Articles

Nanoscale spatial analysis of clay minerals containing cesium by synchrotron radiation photoemission electron microscopy

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

 Percentile:100(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$$_{4,5}$$-edge region showed Cs to be present in a monocation state (Cs$$^{+}$$). Further pinpoint XAS measurements were also performed at the Fe L$$_{2,3}$$-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.

JAEA Reports

Construction of a car-borne survey system for measurement of dose rates in air; KURAMA-II, and its application

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.

Journal Articles

Electron compound nature in a surface atomic layer of a two-dimensional hexagonal lattice

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:52.1(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Reactivity effect of borated stainless steel plate in single and coupled cores composed of low-enriched UO$$_{2}$$ rods

Miyoshi, 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:81.11(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Gamma-ray spectra measurements for long cooled MOX spent fuels

Murakami, Kiyonobu; Kobayashi, Iwao

JAERI-M 93-179, 107 Pages, 1993/09

JAERI-M-93-179.pdf:2.67MB

no abstracts in English

Journal Articles

Temperature effects on reactivity in light water moderated UO$$_{2}$$ cores with soluble poisons

Miyoshi, Yoshinori; Yamamoto, Toshihiro; Suzaki, Takenori; Kobayashi, Iwao

Journal of Nuclear Science and Technology, 29(12), p.1201 - 1211, 1992/12

no abstracts in English

Journal Articles

Reactivity effect of borated stainless steel plates in light-water-moderated UO$$_{2}$$ cores

Miyoshi, Yoshinori; Nakajima, Ken; Kobayashi, Iwao; Aoki, Shigeaki*; *

Transactions of the American Nuclear Society, 66, p.287 - 288, 1992/11

no abstracts in English

Journal Articles

Present status of nuclear criticality safety research; highlights of International Conference on Nuclear Criticality Safety(ICNC-91)

*; Yamane, Yoshihiro*; Kobayashi, Iwao; Tachimori, Shoichi; ; Miyoshi, Yoshinori; Okuno, Hiroshi; Nakajima, Ken; Mitake, Susumu*; *; et al.

Nippon Genshiryoku Gakkai-Shi, 34(4), p.311 - 319, 1992/04

 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

STACY and TRACY: Nuclear criticality experiments facilities under construction

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

JAEA Reports

Measurements and calculations of neutron interaction effects of a two-coupled system in water

Miyoshi, Yoshinori; Suzaki, Takenori; ; Kobayashi, Iwao

JAERI-M 90-112, 45 Pages, 1990/07

JAERI-M-90-112.pdf:0.88MB

no abstracts in English

JAEA Reports

Mock-up apparatus for preparation of plutonium fuel solution for criticality experiments at NUCEF

Sakurai, Satoshi; Hirata, Masaru; ; Usuda, Shigekazu; Abe, Jiro; ; Tachimori, Shoichi; ; Kurihara, Masayoshi; Kobayashi, Iwao

JAERI-M 90-059, 35 Pages, 1990/03

JAERI-M-90-059.pdf:1.38MB

no abstracts in English

Journal Articles

New solution-type critical assembly STACY and TRACY

Miyoshi, Yoshinori; Takeshita, Isao; Kobayashi, Iwao

Nippon Genshiryoku Gakkai-Shi, 31(5), p.536 - 538, 1989/05

no abstracts in English

Journal Articles

A Consideration on difference in subcriticalilies determined by some experimental and calculational methods for water-reflected cores

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

JAEA Reports

Measurement of decay heat from spent fuel assemblies JPDR and JMTR

Murakami, Kiyonobu; Kobayashi, Iwao

JAERI-M 88-128, 18 Pages, 1988/07

JAERI-M-88-128.pdf:0.6MB

no abstracts in English

Journal Articles

Neutronic design of critical facilities(STACY, TRACY) at JAERI for criticality safety research

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

Oral presentation

Facility of radioactive materials beamline at KEK

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).

Oral presentation

Aiming to Fukushima environmental recovery; Elucidation of the Cs desorption mechanism and development of the Cs desorption method for waste volume reduction

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

Oral presentation

Synchrotron radiation photoemission electron microscope observation of Cs-containing clay mineral

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.

Oral presentation

SPring-8 utilization research towards the technical development for Fukushima environmental recovery

Yaita, Tsuyoshi; Shiwaku, Hideaki; Kobayashi, Toru; Awual, M. R.; Suzuki, Shinichi; Motokawa, Ryuhei; Matsumura, Daiju; Tsuji, Takuya; Nishihata, Yasuo; Yoshigoe, Akitaka; et al.

no journal, , 

no abstracts in English

Oral presentation

Pinpoint Analysis of Cs-contained Vermiculite using Synchrotron Radiation PEEM

Yoshigoe, Akitaka; Shiwaku, Hideaki; Kobayashi, Toru; Shimoyama, Iwao; Matsumura, Daiju; Tsuji, Takuya; Nishihata, Yasuo; Yaita, Tsuyoshi; Kogure, Toshihiro*; Motai, Satoko*; et al.

no journal, , 

Pinpoint chemical analysis for Cs-adsorbed vermiculite was performed by using synchrotron radiation photoelectron emission microscopy (SR-PEEM). It was found that Cs is distributed through the micro-size clay particles and we also succeeded to measure pinpoint X-ray absorption spectra for constituent element simultaneously. Furthermore, we precisely confirmed the existence of Fe in the sample.

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