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Matsubara, Akihiro; Fujita, Natsuko; Kimura, Kenji
Proceedings of the 8th East Asia Accelerator Mass Spectrometry Symposium and the 22nd Japan Accelerator Mass Spectrometry symposium (EA-AMS 8 & JAMS-22), p.57 - 59, 2020/00
no abstracts in English
Teshigawara, Makoto; Tsuchikawa, Yusuke*; Ichikawa, Go*; Takata, Shinichi; Mishima, Kenji*; Harada, Masahide; Oi, Motoki; Kawamura, Yukihiko*; Kai, Tetsuya; Kawamura, Seiko; et al.
Nuclear Instruments and Methods in Physics Research A, 929, p.113 - 120, 2019/06
Times Cited Count:16 Percentile:86.05(Instruments & Instrumentation)A nano-diamond is an attractive neutron reflection material below cold neutron energy. The total neutron cross section of a nano-diamond was derived from a neutron transmission measurement over the neutron energy range of 0.2 meV to 100 meV because total neutron cross section data were not available. The total cross section of a nano-diamond with particle size of approximately 5 nm increased with a decrease in neutron energy to 0.2 meV. It was approximately two orders of magnitude larger than that of graphite at 0.2 meV. The contribution of inelastic scattering to the total cross section was to be shown negligible small at neutron energies of 1.2, 1.5, 1.9, 2.6, and 5.9 meV in the inelastic neutron scattering measurement. Moreover, small-angle neutron scattering measurements of the nano-diamond showed a large scattering cross section in the forward direction for low neutron energies.
Baba, Yuji; Shimoyama, Iwao
Photon Factory Activity Report 2016, 2 Pages, 2017/00
In order to elucidate the adsorption states of radioactive Sr-90 in soil, chemical bonding states of non-radioactive strontium adsorbed on layered oxide (mica) have been investigated by X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) spectroscopy. Since the number of atoms in radioactive Sr-90 is extremely small, the XPS and XANES were measured under total reflection condition of the incident X-rays. The detection limit in total reflection XPS was about 150 pg/cm, which corresponds to 300 Bq of Sr-90. The Sr 2p core-level energy in XPS shifted to lower energy with the decrease in the thickness of Sr layer. Also, the Sr 2p Sr 4d resonance energy in XANES shifts to lower energy with the decrease in the thickness. On the basis of a simple point charge model, it was elucidated that the chemical bond between Sr and mica surface becomes ionic with the decrease in the adsorbed amount of strontium.
Baba, Yuji; Shimoyama, Iwao; Hirao, Norie; Izumi, Toshinori
e-Journal of Surface Science and Nanotechnology (Internet), 13, p.417 - 421, 2015/09
Times Cited Count:1The interaction between alkali metals and oxides has attracted much attention as heterogeneous catalysis, chemical reaction promoters, and high intensity electron emitter. Also the interaction of cesium and oxides has become important subject, because radioactive cesium trapped in minerals such as clay and soil may cause health risks. In the present study, we analyzed chemical states of ultra-trace amount of cesium on oxide surfaces by total reflection X-ray photoelectron spectroscopy (TR-XPS) exited by synchrotron radiation. For the adsorbed cesium thicker than 0.01 layer, cesium is weakly bound with oxide through Van-der-Waals force. On the other hand, for ultra-thin layer about 0.002 layer, the chemical bond changes to covalent bond. It is suggested that this change in the chemical bonding state is one of the reasons why radioactive cesium is hard to be released from minerals.
Imazono, Takashi; Yanagihara, Mihiro*
Photon Factory News, 22(3), p.18 - 22, 2004/11
Using soft-X-ray fluorescence spectroscopy with photon incidence at a critical angle of total reflection, it was made clear that SiO existed within a depth of a few nanometers from the surface of Fe/Si multilayers. It was generated by oxidation of the interdiffused FeSi layer nearest to the topmost Fe layer. Consequently, the FeSi layer was found to decrease in thickness. This result suggests that the total-reflection soft-X-ray fluorescence spectroscopy is fairly useful to analyze the chemical state of elements to a depth of a few nanometers from the surface.
Bin, C.; Soyama, Kazuhiko
JAERI-Conf 2001-002, p.592 - 599, 2001/03
no abstracts in English
Kubo, Hirotaka; Takenaga, Hidenobu; Sugie, Tatsuo; Higashijima, Satoru; *; Sakasai, Akira; Hosogane, Nobuyuki
Plasma Physics and Controlled Fusion, 40(6), p.1115 - 1126, 1998/00
Times Cited Count:64 Percentile:86.63(Physics, Fluids & Plasmas)no abstracts in English
Soyama, Kazuhiko
Radioisotopes, 46(11), p.852 - 858, 1997/11
no abstracts in English
; Nomura, Yasushi
Nihon Genshiryoku Gakkai-Shi, 39(10), p.832 - 841, 1997/00
Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)no abstracts in English
Takada, Hiroshi
Journal of Nuclear Science and Technology, 33(4), p.275 - 282, 1996/04
Times Cited Count:19 Percentile:81.69(Nuclear Science & Technology)no abstracts in English
Soyama, Kazuhiko; Minakawa, Nobuaki; *; Kodaira, Tsuneo
Journal of Nuclear Science and Technology, 32(1), p.78 - 80, 1995/01
Times Cited Count:4 Percentile:49.19(Nuclear Science & Technology)no abstracts in English
Watanabe, Tadashi; ; Yokokawa, Mitsuo
Physical Review E, 49(5), p.4060 - 4064, 1994/05
Times Cited Count:39 Percentile:81.36(Physics, Fluids & Plasmas)no abstracts in English
Okuno, Hiroshi; Naito, Yoshitaka; *; *
JAERI-M 89-140, 32 Pages, 1989/10
no abstracts in English
; *;
JAERI-M 86-140, 39 Pages, 1986/09
no abstracts in English
Polym.Commun., 26, p.16 - 19, 1985/00
no abstracts in English
; Murakami, Yoshio
Journal of Nuclear Materials, 121, p.254 - 263, 1984/00
Times Cited Count:5 Percentile:51.32(Materials Science, Multidisciplinary)no abstracts in English
; *
Nuclear Technology, 47(1), p.189 - 199, 1980/00
Times Cited Count:4 Percentile:48.95(Nuclear Science & Technology)no abstracts in English
*;
JAERI-M 7611, 21 Pages, 1978/03
no abstracts in English
Nuclear Instruments and Methods, 137(1), p.99 - 101, 1976/01
no abstracts in English
*;
JAERI-M 6297, 14 Pages, 1975/11
no abstracts in English