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Kwon, H.*; Shiga, Motoyuki; Kimizuka, Hajime*; Oda, Takuji*
Acta Materialia, 247, p.118739_1 - 118739_11, 2023/04
Times Cited Count：14 Percentile：90.29(Materials Science, Multidisciplinary)We estimate the diffusivity of dilute hydrogen in body-centered-cubic metals, Nb, Fe, and W, from path integral simulations using machine-learning moment tensor potentials with an accuracy level of density functional theory. Our computational results show great agreement with some experimental results that appear to be accurate. The isotope effects are also reproduced consistently with the experimental data.
Kuno, Yusuke; Tazaki, Makiko; Akiba, Mitsunori*; Adachi, Takeo*; Takashima, Ryuta*; Omoto, Akira*; Oda, Takuji*; Choi, J.-S.*; Tanaka, Satoru*
Proceedings of INMM 53rd Annual Meeting (CD-ROM), 10 Pages, 2012/07
This paper will present brief historical review of multilateral nuclear approach (MNA), and based on which, a basic concept of a reliable framework of nuclear fuel cycle, where the fuel-cycle services could be provided without discrimination and meet the international 3S requirements, is discussed.
Seito, Hajime; Hakoda, Teruyuki; Hanaya, Hiroaki; Haruyama, Yasuyuki; Kaneko, Hirohisa; Yamashita, Takashi*; Kojima, Takuji
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 150, 2012/01
no abstracts in English
Seito, Hajime; Matsui, Shinjiro*; Hakoda, Teruyuki; Ishikawa, Masayoshi*; Haruyama, Yasuyuki; Kaneko, Hirohisa; Kimura, Jun*; Kojima, Takuji
Zairyo Gijutsu, 30(1), p.10 - 16, 2012/01
The dosimetry of a 110 keV electron beam (EB) irradiation field is studied using a calorimeter, film dosimeter, and Monte Carlo simulation. This is important base for dose control in practical processing to guarantee the process reproducibility and product reliability. The simulation results are validated on the measurement of the energy fluence obtained by the calorimeter at one position in the air plane at different distances from a beam exit window. The spatial dose distribution obtained from the simulation is compared to that obtained by the film dosimeter. They show good agreement within 
5.0%. The precision of 5.0% is sufficient to control the surface modification of polymers and the development of semiconductor devices in practical radiation processing. These results suggest that film dosimetry results at just one position in the air plane are sufficient to determine the irradiation characteristics of the low energy EB, and to provide a base of quality control measures in practical radiation processing.
Kuno, Yusuke; Oda, Takuji*; Tanaka, Satoru*; Fukasawa, Tetsuo*; Tanabe, Tomoyuki*; Tamai, Hiroshi; Horio, Kenta*; Hamasaki, Manabu*; Shinohara, Nobuo*; Ikeda, Yuta*
Proceedings of INMM 52nd Annual Meeting (CD-ROM), 10 Pages, 2011/07
The substance and implication of PR from the viewpoints of risk evaluation on nuclear proliferation was studied in this paper. As an example, ten next-generation reprocessing technology candidates were evaluated with GIF PR and PP methodology to find degree of relative difference in PR from the presently available technology - PUREX. PR effectiveness in proliferation risk was also assessed and it was found that the effectiveness of PR measures is subject to the status of each nation.
Hirota, Koichi; Hakoda, Teruyuki; Shimada, Akihiko; Taguchi, Mitsumasa; Kimura, Atsushi; Kojima, Takuji
Proceedings of 12th International Conference on Radiation Curing in Asia (RadTech Asia 2011) (Internet), p.108 - 109, 2011/06
We have focused on using MnO
for the oxidation of intermediates produced from electron beam irradiation of VOC. Manganese dioxide can decompose ozone, produced by the irradiation of air containing VOCs, into activated oxygen, which can ultimately oxide the intermediates. Hybrid system equipped with electron accelerator and MnO has demonstrated the complete oxidation of the intermediates produced during the irradiation of xylene and toluene. The electron-beam treatment of dioxin from municipal solid waste incinerator was carried out at Takahama Clean Center in Japan. An incinerator gas of 1000 m
N/h was diverted downstream of a dry electric precipitator and was irradiated with electron beams using an electron accelerator that supplied 300 kV with a maximum energy of 12 kW. The results showed electron-beam is a promising technology for destroying dioxin in exhaust gases.
under electron beam irradiationHakoda, Teruyuki; Matsumoto, Kanae; Mizuno, Akira*; Narita, Tadashi*; Kojima, Takuji; Hirota, Koichi
IEEE Transactions on Industry Applications, 44(6), p.1950 - 1956, 2008/11
Times Cited Count：3 Percentile：33.74(Engineering, Multidisciplinary)Oxidation of xylene and its irradiation-induced organic byproducts in air using Ag-loaded TiO (Ag/TiO) beds was studied under electron beam (EB) irradiation. The Ag/TiO beds were placed in an irradiation or a non-irradiation space in order to identify the oxidation of xylene/its byproducts by EB irradiation, by catalytic process, and by a combination of the two. Placement of the Ag/TiO bed to the irradiation space resulted in the suppression of xylene decomposition. On the other hand, production of CO was observed in the gas phase of the irradiation space and on the surface of the Ag/TiO pellets placed both in the irradiation and non-irradiation spaces. The concentration of CO became higher when the layer was placed in the non-irradiation space. The production of CO was enhanced by loading of Ag to the TiO pellet surface. The highest concentration of CO was obtained for Ag/TiO with Ag contents greater than 5wt%.
Ostapczuk, A.*; Hakoda, Teruyuki; Shimada, Akihiko; Kojima, Takuji
Plasma Chemistry and Plasma Processing, 28(4), p.483 - 494, 2008/08
Times Cited Count：16 Percentile：52.59(Engineering, Chemical)The application of non-thermal plasma generated by electron beam (EB) was investigated in laboratory scale to study decomposition of polycyclic aromatic hydrocarbons like naphthalene and acenaphthene in flue gas. PAH compounds were treated by EB with the dose up to 8 kGy in dry and humid base gas mixtures. Experimentally established G-values gained 1.66 and 3.72 mol/100 eV for NL and AC at the dose of 1 kGy. NL and AC removal was observed in dry base gas mixtures showing that the reaction with OH radical is not exclusive pathway to initialize PAH decomposition, however in the presence of water remarkably higher decomposition efficiency was observed. As by-products of NL decomposition were identified compounds containing one aromatic ring and oxygen atoms besides CO and CO. It led to the conclusion that PAH decomposition process in humid flue gas can be regarded as multi-step oxidative de-aromatization analogical to its atmospheric chemistry.
Hakoda, Teruyuki; Matsumoto, Kanae; Shimada, Akihiko; Narita, Tadashi*; Kojima, Takuji; Hirota, Koichi
Radiation Physics and Chemistry, 77(5), p.585 - 590, 2008/05
Times Cited Count：9 Percentile：51.71(Chemistry, Physical)The electron beam (EB) oxidation of gaseous xylene in air, appearing as ventilation gases emitted from painting factories, was investigated under various experimental conditions. Thereby the implementation of an ozone decomposition catalyst, MnO, into EB-induced oxidation of xylene/air mixtures strongly contributed in the achievement of a better purification degree.
under electron beam irradiationHakoda, Teruyuki; Matsumoto, Kanae; Mizuno, Akira*; Kojima, Takuji; Hirota, Koichi
Plasma Chemistry and Plasma Processing, 28(1), p.25 - 37, 2008/02
Times Cited Count：22 Percentile：62.85(Engineering, Chemical)The oxidation of xylene and its irradiation byproducts in air using TiO was studied under electron beam (EB) irradiation for the purification of ventilation gases emitted from paint factories. EB irradiation experiments were performed mainly under two different conditions: a TiO pellet layer was placed in an irradiation or non-irradiation space. The results revealed that xylene was decomposed and CO was formed in the gas phase of the irradiation space irrespective of the presence of the TiO pellets, while CO was produced in the gas phase of the irradiation space and on the surface of the TiO pellets. The total CO concentration increased when the pellet layer was in the non-irradiation space. On the other hand, the concentration of CO produced on the surface of the TiO pellets in the irradiation space was higher than that in a non-irradiation space.
Shimada, Akihiko; Hakoda, Teruyuki; Kojima, Takuji; Takubo, Takeshi*; Iwasaki, Tatsuyuki*; Kinoshita, Shinobu*
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 60, 2007/02
no abstracts in English
Hirota, Koichi; Taguchi, Mitsumasa; Hakoda, Teruyuki; Kojima, Takuji
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 59, 2007/02
no abstracts in English
Shimada, Akihiko; Hakoda, Teruyuki; Kojima, Takuji
Journal of Chemical Engineering of Japan, 39(9), p.980 - 986, 2006/09
Times Cited Count：0 Percentile：0.00(Engineering, Chemical)Electron beam (EB) suitable for decomposition of dilute organic pollutants in high-flow rate air was applied to the treatment of formaldehyde (HCHO)/air mixture for purification in the clean room after sterilization. Air mixtures containing 90-1230 ppmv of HCHO with and without 30-340 ppmv of methanol (CH
OH), which are commonly used for sterilization, were irradiated by EB to the absorbed doses of 5-80 kGy (=kJ/kg). The dose required for decreasing initial HCHO concentration to 10 ppmv was examined as a function of initial HCHO concentration (ppmv) in the air mixture ([HCHO]
) with and without CHOH. The following relations were obtained: 
=-4.2
10
[HCHO]
+1.210
[HCHO]-1.2 and =-3.810[HCHO]+1.010 [HCHO]-1.0, respectively, where (kGy) is dose. According to these results, the treatment completion time of HCHO/air mixture with CHOH using EB was simulated considering the conceptual processing. This EB processing can be applicable, e.g. the clean rooms at the food packaging factories, and contributes to improve the operation efficiency of the factories.
Hakoda, Teruyuki; Sako, Toshihiro*; Shimada, Akihiko; Ishida, Tsuneo*; Kojima, Takuji
Bulletin of the Chemical Society of Japan, 79(5), p.731 - 737, 2006/05
Times Cited Count：5 Percentile：26.44(Chemistry, Multidisciplinary)no abstracts in English
Hakoda, Teruyuki; Shimada, Akihiko; Kojima, Takuji
Radiation Physics and Chemistry, 75(3), p.392 - 402, 2006/03
Times Cited Count：3 Percentile：23.82(Chemistry, Physical)no abstracts in English
Hakoda, Teruyuki; Goto, Hitoshi*; Shimada, Akihiko; Ochi, Masafumi*; Kojima, Takuji
Radiation Physics and Chemistry, 75(3), p.375 - 383, 2006/03
Times Cited Count：8 Percentile：48.89(Chemistry, Physical)no abstracts in English
Kasahara, Mikio*; Ma, C.-J.*; Okumura, Motonori*; Kojima, Takuji; Hakoda, Teruyuki; Taguchi, Mitsumasa; Sakai, Takuro; Ohara, Yoshihiro
JAEA-Review 2005-001, TIARA Annual Report 2004, p.293 - 295, 2006/01
Artificial cloud generation experiment was performed using a huge vertical pit located in Kamaishi iron-copper mine to investigate the characteristics of cloud. The physical and chemical properties of individual cloud droplets were examined by microscopic analysis at Kyoto university and micro-PIXE analysis at TIARA. The process of growth of cloud was clarified based on the result on droplet size, its distribution, droplet number concentration, and the change in distribution of chlorine in droplet as the function of size.
Hakoda, Teruyuki; Kojima, Takuji
Radiation Physics and Chemistry, 74(5), p.302 - 309, 2005/12
Times Cited Count：0 Percentile：0.00(Chemistry, Physical)no abstracts in English
TiO under varied surface conditionOlivares, R.*; Oda, Takuji*; Oya, Yasuhisa*; Tanaka, Satoru*; Tsuchiya, Kunihiko
Fusion Engineering and Design, 75-79, p.765 - 768, 2005/11
Times Cited Count：9 Percentile：52.30(Nuclear Science & Technology)no abstracts in English
Hakoda, Teruyuki; Hanaya, Hiroaki; Kaneko, Hirohisa; Miyashita, Atsumi; Kojima, Takuji
Radioisotopes, 54(6), p.161 - 168, 2005/06
no abstracts in English
