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Omura, Yoshihito*; Dohi, Terumi
Raiken, 21(2), p.27 - 28, 2021/04
no abstracts in English
Suno, Hiroya; Machida, Masahiko
RIST News, (66), p.3 - 16, 2020/10
no abstracts in English
Baba, Yuji; Shimoyama, Iwao; Hirao, Norie*
Applied Surface Science, 384, p.511 - 516, 2016/10
Times Cited Count：5 Percentile：25.9(Chemistry, Physical)Chemical states of cesium as well as the other alkali metals (sodium and rubidium) sorbed in micaceous oxides have been investigated by total reflection X-ray photoelectron spectroscopy (TR-XPS). For cesium, it was shown that ultra-trace amount of cesium down to about 100 pg/cm
can be detected by TR-XPS. This amount corresponds to about 200 Bq of 
Cs (t
= 30.2y). It was demonstrated that ultra-trace amount of cesium corresponding to radioactive cesium level can be measured by TR-XPS. As to the chemical states, it was found that core-level binding energy in TR-XPS for trace-level cesium shifted to lower-energy side compared with that for thicker layer. A reverse tendency is observed in sodium. Based on charge transfer within a simple point-charge model, it is concluded that chemical bond between alkali metal and micaceous oxide for ultra-thin layer is more polarized that for thick layer.
Watanabe, Takeshi*; Tsushima, Satoru*; Yamamoto, Ichiro*; Tomioka, Osamu; Meguro, Yoshihiro; Nakashima, Mikio; Wada, Ryutaro*; Nagase, Yoshiyuki*; Fukuzato, Ryuichi*
Proceedings of 2nd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications (Super Green 2003), p.363 - 366, 2004/00
Recovery of salts by supercritical fluid leaching (SFL) method using carbon dioxide was experimentally studied. It was confirmed that LiCl was recovered with a mixed fluid of carbon dioxide and methanol, and KCl and SrCl
were recovered with a mixed fluid of carbon dioxide, methanol and crown ether. The influence of crown ether for KCl and SrCl extraction were found to increase in the order of 15-crown-5 (15C5) 
18-crown-6 (18C6) dicychlohexyl-18-crown-6 (DC18C6). It is expected that other salts can be recovered selectively with a mixed fluid of carbon dioxide, methanol and suitable crown ether.
Nagase, Yoshiyuki*; Masuda, Kaoru*; Wada, Ryutaro*; Yamamoto, Ichiro*; Tomioka, Osamu; Meguro, Yoshihiro; Fukuzato, Ryuichi*
Proceedings of 2nd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications (Super Green 2003), p.254 - 257, 2004/00
no abstracts in English
C=C:) from charge inversion mass spectrometryHayakawa, Shigeo*; Tomozawa, Koji*; takeuchi, takae*; Arakawa, Kazuo; Morishita, Norio
Physical Chemistry Chemical Physics, 5(11), p.2386 - 2390, 2003/05
Times Cited Count：15 Percentile：44.45(Chemistry, Physical)The process of formation of the negative ions in charge inversion mass spectrometry is via near-resonant neutralization followed by spontaneous dissociation, and then endothermic negative ion formation. The intensity of the C
peak relative to the CH peak in these spectra increased with decreasing ionization potential of the targets for both of the isomeric CH
cations. The formation of the C anion is proposed to result from the dissociation of excited CH neutrals into C and H. The dependence on target species of the intensities of C peak relative to the CH peak for HCCH and HC=C: cannot be rationalized by the internal energy of the excited CH neutrals. The differences indicate that the isomeric CH neutrals dissociate into CH and H prior to 1,2-hydrogen atom migration.
Hayakawa, Shigeo*; Harada, Kengo*; Watanabe, Nobuaki*; Arakawa, Kazuo; Morishita, Norio
International Journal of Mass Spectrometry, 202(1-3), p.A1 - A7, 2000/10
Times Cited Count：16 Percentile：60.07(Physics, Atomic, Molecular & Chemical)no abstracts in English
Hayakawa, Shigeo*; Harada, Kengo*; Arakawa, Kazuo; Morishita, Norio
Journal of Chemical Physics, 112(19), p.8432 - 8435, 2000/05
Times Cited Count：19 Percentile：50.82(Chemistry, Physical)no abstracts in English
Iwase, Masanori*
JNC TJ8400 2000-063, 78 Pages, 2000/03
JNC-TJ8400-2000-063.pdf:1.93MB
This study is aimed at controlling oxidation reaction of molten metal by ash in incineration systems, and at positively utilizing the oxidation reaction for decontamination of slag. In this year, in order to investigate physico-chemical properties of mixed fused salt containing alkali sulfates, with special focus on the behaviour of oxygen anion in the melts, Cu
/ Cu redox equilibrium experiments were carried out. Among the effect of various parameters on Cu / Cu ratio in binary and ternary alkali sulfate melts, the effect of partial pressures of oxygen and SO was mainly investigated in the study. Variation in Cu / Cu ratio were presented as the function of partial pressures of oxygen and SO, respectively. Possible thermodynamic interpretation were made on the experimental results. In addition, the dissolution of CrO
in mixed alkali sulfates were also investigated as a first step to elucidate the mechanism of hot corrosion. With this investigation, an important finding was obtained that the solubility of CrO for melts with same average ionic radius, in other words, oxygen ion activity, were essentially identical under constant temperature and atmosphere.
Wada, Yukio; Funasaka, Hideyuki; Myochin, Munetaka; Yamamoto, Kazunori; Harada, Hideo; ;
PNC TN8100 96-005, 16 Pages, 1996/01
no abstracts in English
H
isomeric ions by charge inversion mass spectrometry using an alkali metal target*; *; Arakawa, Kazuo; Morishita, Norio; *
Int. J. Mass Spectrom. Ion Process, 151, p.89 - 95, 1995/00
no abstracts in English
with the perovskite structureHinatsu, Yukio
Journal of Alloys and Compounds, 203, p.251 - 257, 1994/00
Times Cited Count：23 Percentile：81.05(Chemistry, Physical)no abstracts in English
Fujino, Takeo
Nihon Genshiryoku Gakkai-Shi, 20(4), p.241 - 254, 1978/04
Times Cited Count：5no abstracts in English
; Iwamoto, K.
JAERI-M 5927, 22 Pages, 1974/12
no abstracts in English
Kawai, Kota*; Nakano, Yoshio*; Takeshita, Kenji*; Nagai, Takayuki; Kobayashi, Hidekazu; Amamoto, Ippei; Ayame, Yasuo
no journal, ,
no abstracts in English
Baba, Yuji; Shimoyama, Iwao; Hirao, Norie*
no journal, ,
Chemical states of trace-level alkali metals (Na, Rb, Cs) and alkaline-earth metals (Sr) adsorbed on oxides and sorbed in micaceous oxides have been investigated by X-ray photoelectron spectroscopy under X-ray total-reflection (TR) condition. Owing to the background reduction in TR-XPS spectra, we could observe down to 100 pg/cm for cesium and 150 pg/cm for strontium, respectively, sorbed in micaceous oxides. These amounts correspond to about 200 Bq of Cs (t1/2=30.2y), and 300 Bq of 90Sr (t1/2=28.8y), so it was demonstrated that trace-level cesium and strontium corresponding to radionuclide level can be measured by TR-XPS. As to the chemical states, it is concluded that the chemical bond between alkali metals and micaceous oxide for ultra-thin layer is more polarized that for thick layer on the basis of a charge transfer within a simple point-charge model.
Yamamoto, Masahiko; Do, V. K.; Taguchi, Shigeo; Takamura, Yuzuru*; Kuno, Takehiko
no journal, ,
The measurement conditions of Na, K, Ca, Sr, Ba by liquid electrode plasma optical emission spectrometry (LEP-OES) have been optimized. The samples from reprocessing process plant such as highly active liquid waste has been also measured by LEP-OES.
