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Takahara, Shogo; Ikegami, Maiko*; Yoneda, Minoru*; Kondo, Hitoshi*; Ishizaki, Azusa; Iijima, Masashi; Shimada, Yoko*; Matsui, Yasuto*
Risk Analysis, 37(7), p.1256 - 1267, 2017/07
Times Cited Count:6 Percentile:52.04(Public, Environmental & Occupational Health)Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; Tsunoda, Yusuke*; Otsuka, T.*; Nishimura, Shunji*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; et al.
Physics Letters B, 765, p.328 - 333, 2017/02
Times Cited Count:34 Percentile:91.97(Astronomy & Astrophysics)Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; Nishimura, Shunji*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; Lorusso, G.*; Patel, Z.*; et al.
Physical Review C, 93(3), p.034328_1 - 034328_14, 2016/03
Times Cited Count:25 Percentile:85.25(Physics, Nuclear)Benzoni, G.*; Morales, A. I.*; Watanabe, H.*; Nishimura, Shunji*; Coraggio, L.*; Itaco, N.*; Gargano, A.*; Browne, F.*; Daido, R.*; Doornenbal, P.*; et al.
Physics Letters B, 751, p.107 - 112, 2015/12
Times Cited Count:20 Percentile:78.02(Astronomy & Astrophysics)Kanda, Kazuhiro*; Yokota, Kumiko*; Tagawa, Masahito*; Tode, Mayumi; Teraoka, Yuden; Matsui, Shinji*
Japanese Journal of Applied Physics, 50(5), p.055801_1 - 055801_3, 2011/05
Recently, the irradiation of soft X-ray synchrotron radiation (SR) to highly-hydrogenated diamond-like-carbon (H-DLC) films in vacuum results in the desorption of hydrogen and the increase of film density, hardness and refractive index. In this study, we investigated SR irradiation effects on the H-DLC with different hydrogen contents. The H-DLC thin films were deposited on an Si wafer with 200 nm thickness by an amplitude-modulated radio frequency plasma chemical vapor deposition method. The SR irradiation was carried out at NewSUBARU BL6. The SR has a continuous spectrum from IR to soft X-ray, which is lower than 1 keV. The hydrogen content dependence on SR dose was estimated using elastic recoil detection analysis (ERDA) and Rutherford backscattering (RBS) techniques. The hydrogen content was kept constant in the low-hydrogenated DLC film, while that in the high-hydrogenated DLC film decreased exponentially with soft X-ray dose.
Kanda, Kazuhiro*; Yokota, Kumiko*; Tagawa, Masahito*; Tode, Mayumi; Teraoka, Yuden; Matsui, Shinji*
Japanese Journal of Applied Physics, 50(5), p.055801_1 - 055801_3, 2011/05
Times Cited Count:11 Percentile:43.98(Physics, Applied)Takase, Hiroyasu*; Inagaki, Manabu*; Noguchi, Toshihide*; Shimaoka, Akiko*; Martin, A. J.*; Wakamatsu, Hisanori*; Takase, Kyoko*; Tabara, Michiko*; Matsui, Hiroya
JAEA-Research 2007-066, 215 Pages, 2007/08
In this study a systematic approach to explicitly address type and size of uncertainties associated with safety assessment due mainly to incomplete knowledge on a spatially heterogeneous geological environment was developed. In this approach a wide range of model variations including the ones with relatively law plausibility are taken into account so that ambiguity remaining in the knowledge is illustrated, which is a distinctive feature of the approach compared with the conventional methodology where only a limited number of best plausible model variations are considered. The study also proposed an approach to assessing plausibility of each model variation based on multiple pieces of evidence by using evidential support logic (ESL). Furthermore the approach was applied to Horonobe area to demonstrate its applicability to the similar class of geological environment as an example.
Belik, A. A.*; Iikubo, Satoshi; Yokosawa, Tadahiro*; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Azuma, Masaki*; Takano, Mikio*; Kimoto, Koji*; Matsui, Yoshio*; et al.
Journal of the American Chemical Society, 129(4), p.971 - 977, 2007/01
Times Cited Count:182 Percentile:95.3(Chemistry, Multidisciplinary)Structural properties of polycrystalline single-phased BiMnO samples prepared at 6 GPa and 1383 K have been studied by selected area electron diffraction (SAED), convergent beam electron diffraction (CBED), and the Rietveld method using neutron diffraction data measured at 300 and 550 K. The SAED and CBED data showed that BiMnO crystallizes in the centrosymmetric space group C2/c at 300 K. The analysis of Mn-O bond lengths suggested that the orbital order present in BiMnO at 300 K melts above T= 474 K. The phase transition at 474 K is of the first order and accompanied by a jump of magnetization and small changes of the effective magnetic moment and Weiss temperature.
Kaneko, Fusae*; Tanaka, Masahito*; Narita, Satoru*; Kitada, Tomo*; Matsui, Takahiro*; Nakagawa, Kazumichi*; Agui, Akane; Fujii, Kentaro; Yokoya, Akinari
Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.291 - 294, 2005/06
Times Cited Count:19 Percentile:64.56(Spectroscopy)no abstracts in English
Nakayama, Shintaro*; Yamagata, Tamio*; Akimune, Hidetoshi*; Fujiwara, Mamoru; Fushimi, Kenichi*; Greenfield, M. B.*; Hara, Keigo*; Hara, Kaoru*; Hashimoto, Hisanobu*; Ichihara, Kayoko*; et al.
Nuclear Physics A, 731, p.355 - 362, 2004/02
Times Cited Count:0 Percentile:0.01(Physics, Nuclear)no abstracts in English
Kanda, Kazuhiro*; Yokota, Kumiko*; Tagawa, Masahito*; Tode, Mayumi; Teraoka, Yuden; Matsui, Shinji*
no journal, ,
In the present study, we investigated the desorption of hydrogen from highly-hydrogenated diamond-like-carbon (DLC) films by irradiation of synchrotron radiation (SR) soft X-rays in vacuum. The irradiation of SR was carried out at BL-6 of NewSUBARU. The SR energy is ranging from infra red to soft X-ray, which was lower than 1 keV. The hydrogen content in the DLC films has been determined by Rutherford backscattering (RBS) and elastic recoil detection analysis (ERDA) techniques. Although the hydrogen content in the low-hydrogenated DLC film was independent on the soft X-ray dose, that for the high-hydrogenated DLC film decreased exponentially with the soft X-ray dose. This implies that the desorption of hydrogen takes place from the high-hydrogenated DLC films by the soft X-ray irradiation.
Kanda, Kazuhiro*; Tagawa, Masahito*; Yokota, Kumiko*; Tode, Mayumi; Teraoka, Yuden; Matsui, Shinji*
no journal, ,
In this study, hydrogen desorption processes from highly-hydrogenated DLC films have been investigated by thermal desorption mass stectrometry (TDS) and elastic recoil detection analysis (ERDA). The soft X-ray irradiation was performed at BL-6 in NewSUBARU. The white light is containing infra red to 1000 eV X-ray. The TDS measurements were performed using the thermal desorption measurement system at BL23SU in SPring-8. Although a large peak was observed at around 470 K in the non-X-ray-irradiated DLC film, the peak almost disappeared after irradiation of 300 mAhr synchrotron radiation. ERDA measurements resulted in no change of hydrogen content for lowly-hydrogenated DLC film instead of large decrease of hydrogen for highly-hydrogenated DLC film depending on soft X-ray dose. Hydrogen molecules, which are seen in a TDS spectrum as a low temperature peak, desorb by soft X-ray irradiation so that density and reflective index are changed.
Oba, Kyoko; Yanase, Noboru*; Matsui, Ryota*
no journal, ,
This study designed and conducted a forum for discussions among students of Fukushima National College of Technology on ALPS treated water generated by the decommissioning of the Fukushima Daiichi Nuclear Power Station accident. For the design, we referred to the method of deliberative polls.
Oba, Kyoko; Yanase, Noboru*; Matsui, Ryota*
no journal, ,
This report is the content of a discussion held at Fukushima National College of Technology with reference to the Deliberative Poll on the theme of ALPS treated water generated by the decommissioning of the Fukushima Daiichi Nuclear Power Station accident of Tokyo Electric Power Company.
Yokoyama, Akihiko*; Uesugi, Masaki*; Matsui, Yoshiki; Umino, Yuji*; Kimura, Yoshiki; Yamaguchi, Tomoki
no journal, ,
Collaboration of JAEA and Kanazawa University has verified the analysis accuracy for the establishment of nuclear forensics uranium dating method by alpha-ray spectrometry. In the chemical separation, uranium standards are used to quantify Th-230 produced. In this case, the target for the existence ratio with U-234 is about 1/10000. Therefore, a recovery correction with a tracer was performed and the results were compared with those obtained by a mass spectrometer. In addition, we examined technical issues that contribute to improving analysis accuracy and speeding up analysis time.