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Journal Articles

Development of proton exchange membranes for hydriodic acid concentration by ion-track grafting technique

Tanaka, Nobuyuki; Sawada, Shinichi*; Sugimoto, Chihiro; Yamaki, Tetsuya*

QST-M-33; QST Takasaki Annual Report 2020, P. 37, 2022/03

We have been developing the ion exchange membranes by a radiation grafted polymerization method to improve HI concentration performance for Electro-electrodialysis (EED) in the thermochemical water-splitting hydrogen production iodine-sulfur process. We verify to adopt the cation exchange membrane prepared by ion-track grafted technique. In this membrane preparation technique, one-dimensional cylindrical ion-channel can be formed in the base polymer film by the radiation of the heavy ion beam. And, the excess swelling of the ion-channel could be prevented, expecting that the HI concentration performance could be improved. In our works, The HI concentration experiment was conducted by the electric cell assembled the membrane prepared by the ion-track grafting technique. The HI composition of the tested solution increased, indicating that the tested membrane can operate HI concentration by EED.

Journal Articles

Spectroscopic measurements of L X-rays with a TES microcalorimeter for a non-destructive assay of transuranium elements

Nakamura, Keisuke; Morishita, Yuki; Takasaki, Koji; Maehata, Keisuke*; Sugimoto, Tetsuya*; Kiguchi, Yu*; Iyomoto, Naoko*; Mitsuda, Kazuhisa*

Journal of Low Temperature Physics, 193(3-4), p.314 - 320, 2018/11

 Times Cited Count:0 Percentile:0(Physics, Applied)

JAEA Reports

Crustal deformation analysis by using GPS observation data before and after Tohoku-oki Earthquake in northern Hokkaido, Japan

Tokiwa, Tetsuya; Sugimoto, Shingo*

JAEA-Data/Code 2012-033, 28 Pages, 2013/03

JAEA-Data-Code-2012-033.pdf:10.56MB

GPS analysis was carried out to understand the characteristics of the crustal deformation due to the Tohoku-oki Earthquake in the northern Hokkaido, Japan. The data period for the analysis is from October 1, 2010 to May 31, 2011. The result of the analysis indicated that the displacement in the direction of the south-southeast was detected in this area, and the amount of displacement of the western side of northern Hokkaido is relatively larger than that of the eastern side. Therefore, the eastern side of northern Hokkaido was displaced to the north with respect to Horonobe area, and the west side was displaced to the south. Although the analysis period is short, the crustal deformation is different from a seismic crustal deformation showing the E-W crustal compression.

JAEA Reports

Crustal deformation analysis by using GPS observation data in the northern Hokkaido, Japan

Tokiwa, Tetsuya; Sugimoto, Shingo*

JAEA-Data/Code 2012-024, 53 Pages, 2012/12

JAEA-Data-Code-2012-024.pdf:5.36MB

GPS analysis was carried out to understand the characteristics of the crustal movement in the northern Hokkaido, Japan. GPS data from 33 stations were used for this analysis. The analysis covered data during the period from October 2000 to October 2010. The results of this analysis indicate that this area is in nearly E-W compressive stress field. In addition, dilatation rate and maximum shear strain rate is -70$$sim$$-10$$times$$10$$^{-9}$$ and 50$$sim$$120$$times$$10$$^{-9}$$ strain/year, respectively.

JAEA Reports

Conceptual design and related R&D on ITER mechanical based primary pumping system

Tanzawa, Sadamitsu; Hiroki, Seiji; Abe, Tetsuya; Shimizu, Katsusuke*; Inoue, Masahiko*; Watanabe, Mitsunori*; Iguchi, Masashi*; Sugimoto, Tomoko*; Inohara, Takashi*; Nakamura, Junichi*

JAEA-Technology 2008-076, 99 Pages, 2008/12

JAEA-Technology-2008-076.pdf:35.19MB

The primary vacuum pumping system of the International Thermonuclear Experimental Reactor (ITER) exhausts a helium (He) ash resulting from the DT-burn with excess DT fueling gas, as well as performing a variety of functions such as pump-down, leak testing and wall conditioning. A mechanical based vacuum pumping system has some merits of a continuous pumping, a much lower tritium inventory, a lower operational cost and easy maintenance, comparing with a cryopump system, although demerits of an indispensable magnetic shield and insufficient performance for hydrogen (H$$_{2}$$) pumping are well recognized. To overcome the demerits, we newly fabricated and tested a helical grooved pump (HGP) unit suitable for H$$_{2}$$ pumping at the ITER divertor pressure of 0.1-10 Pa. Through this R&D, we successfully established many design and manufacturing databases of large HGP units for the lightweight gas pumping. Based on the databases, we conceptually designed the ITER vacuum pumping system mainly comprising the HGP with an optimal pump unit layout and a magnetic shield. We also designed conceptually the reduced cost (RC)-ITER pumping system, where a compound molecular pump combining turbine bladed rotors and helical grooved ones was mainly used. The ITER mechanical based primary pumping system proposed has eventually been a back-up solution, whereas a cryopump based one was formally selected to the ITER for construction.

Journal Articles

Construction of monitoring system for biological effects of local ionizing radiation using the nematode ${it C. elegans}$

Higashitani, Atsushi*; Sugimoto, Tomoko*; Mori, Chihiro*; Suzuki, Yoko*; Saito, Rumiko*; Ichishi, Eiichiro*; Sakashita, Tetsuya; Hamada, Nobuyuki*; Wada, Seiichi*; Kakizaki, Takehiko; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 113, 2007/02

no abstracts in English

Journal Articles

Cell cycle arrest and apoptosis in ${it Caenorhabditis elegans}$ germline cells following heavy-ion microbeam irradiation

Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Wada, Seiichi; Hamada, Nobuyuki*; Kakizaki, Takehiko; Kobayashi, Yasuhiko; Higashitani, Atsushi*

International Journal of Radiation Biology, 82(1), p.31 - 38, 2006/01

 Times Cited Count:40 Percentile:92.94(Biology)

no abstracts in English

Oral presentation

Radiation effect and bystander effect of heavy ion particle irradiation on apoptosis in ${it Caenorhabditis elegans}$ germ cell development

Higashitani, Atsushi*; Sugimoto, Tomoko*; Dazai, Kumiko*; Mori, Chihiro*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

Study of biological responses to ionizing radiation in the germline cells of ${it C. elegans}$

Mori, Chihiro*; Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko; Ichishi, Eiichiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Study of biological responses to heavy-ion microbeams in the nematode ${it C. elegans}$

Higashitani, Atsushi*; Mori, Chihiro*; Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

Synthesis of a nitrogen-containing carbon material with oxygen reduction activity from polymer precursors

Idesaki, Akira; Sugimoto, Masaki; Shimada, Akihiko; Yamamoto, Shunya; Taguchi, Mitsumasa; Yamaki, Tetsuya

no journal, , 

Recently, development of platinum-substitute catalysts has been studied extensively; it has been found that a nitrogen-containing carbon material shows oxygen reduction activity almost same as platinum metal. We have been studying about synthesis process of a nitrogen-containing carbon material by pyrolysis of polymer precursors which are easy to be shaped as fiber, film, and so on. In this work, some materials were selected as polymer precursors and their organic-inorganic conversion process were investigated. It was found that polyimide and phenol resin show high carbon yield of 50-60% and graphite structure is formed above 800$$^{circ}$$C.

Oral presentation

Precipitation of Pt nanoparticles on CeO$$_{2}$$ films using electron beams and $$gamma$$-rays

Yamamoto, Shunya; Sugimoto, Masaki; Miyashita, Atsumi; Hakoda, Teruyuki; Yamaki, Tetsuya; Mori, Toshiyuki*

no journal, , 

Platinum modified with cerium oxide (Pt-CeO$$_{x}$$) is considered as promising cathode materials for use in polymer membrane electrolyte fuel cells. A key process to make this active is formation of highly dispersed Pt nanoparticles on a CeO$$_{2}$$ surface. Therefore, there is a strong motivation for us to use this radiation technique for precipitation of the Pt nanoparticles on CeO$$_{2}$$ films, which would be expected to be a model electrocatalyst of Pt-CeO$$_{x}$$. We deposited the CeO$$_{2}$$ films on a SiO$$_{2}$$ substrate by magnetron sputtering. The CeO$$_{2}$$ films in an aqueous solution containing H$$_{2}$$PtCl$$_{6}$$ and C$$_{2}$$H$$_{5}$$OH were irradiated with 2 MeV electron beams and $$^{60}$$Co $$gamma$$-rays at 50 kGy at maximum. The detailed analysis revealed homogeneous precipitation of metallic Pt by the irradiation with both the radiations, suggesting high applicability of the radiation-induced precipitation method to the preparation of the model Pt-CeO$$_{x}$$ electrocatalysts.

Oral presentation

Synthesis of carbon-based electrocatalysts by electron beam irradiation

Ota, Tomonori*; Hagiwara, Tokio*; Sugimoto, Masaki; Yamamoto, Shunya; Koshikawa, Hiroshi; Yamaki, Tetsuya

no journal, , 

Nitrogen (N)-doped carbon-based electrocatalysts are expected as a platinum alternative material for cost reduction of polymer electrolyte membrane fuel cells. However, nobody has not yet established the method of introducing N atoms in a graphene structure at high concentrations. Therefore, our purpose is to propose a new method of N doping using electron beam irradiation at high temperatures in an ammonia atmosphere. We developed here a sample chamber with a heating device, gas inlet and outlet, which made it possible to perform the irradiation without any temperature change. As a result, the phenolic resin, that is, a source of carbon-based electrocatalysts was irradiated with 2 MeV electrons at a dose rate of 2 kGy/s while being maintained at 300 $$^{circ}$$C with a high precision as $$pm$$2 $$^{circ}$$C.

Oral presentation

Preparation of metal nano-needles using ion-track membranes

Koshikawa, Hiroshi; Yamamoto, Shunya; Sugimoto, Masaki; Kitamura, Akane; Sawada, Shinichi; Yamaki, Tetsuya

no journal, , 

Chemical etching of polymer films irradiated with heavy ions leads to the formation of ion-track membranes with nanoscale pores in different shapes. Particularly, conically-shaped pores are expected to have a potential to create metallic nanoneedles by combination of vapor-deposition and electroplating methods. In this study, we prepared copper nanoneedles inside the conical pores of polyimide (PI)-based ion-track membranes and investigated their morphology. The PI films were irradiated with $$^{40}$$Ar ions. The irradiated films were etched in a sodium hypochlorite solution at 60$$^{circ}$$C for 0.5 h, leading to the formation of conical pores with a surface diameter of ca. 500 nm. A very thin Au layer was deposited on this pore side of the ion-track membranes; then, it was used as a cathode for electroplating copper into the pores. After dissolving the PI templates, we obtained the copper needles ca. 500 nm in base diameter and 1.2 $$mu$$m in height on copper plates.

Oral presentation

Effect of nitrogen doping in carbon-based catalyst materials by electron-beam irradiation in ammonia

Ota, Tomonori*; Yamaki, Tetsuya; Sugimoto, Masaki; Yamamoto, Shunya; Koshikawa, Hiroshi; Hagiwara, Tokio*

no journal, , 

Nitrogen-doped carbon-based catalysts are expected as Pt alternatives, and however there have been so far no established methods to introduce N atoms into graphene structures. Thus, we report N doping in carbon-based catalysts by electron beam (EB) irradiation in ammonia (NH$$_{3}$$). A precursor was phenolic resin or its mixture with 5 or 10 wt% cobalt(II) chloride (CoCl$$_{2}$$); it was then irradiated with 2 MeV electron beam up to a dose of 6 MGy in 1 vol% NH$$_{3}$$ at 400$$^{circ}$$C. This irradiated powder was carbonized in an Ar atmosphere at 800$$^{circ}$$C for 1 h. An N-doping level reached an atomic concentration of ca. 0.5% when 5 wt% CoCl$$_{2}$$ was mixed in the precursor.

Oral presentation

Nitrogen doping in carbon-based cathode catalysts using non-equilibrium process induced by electron-beam irradiation

Sugimoto, Masaki; Ota, Tomonori*; Yamamoto, Shunya; Koshikawa, Hiroshi; Yamaki, Tetsuya; Hagiwara, Tokio*

no journal, , 

no abstracts in English

Oral presentation

L X-ray spectrometry of transuranium elements using the TES microcalorimeter

Nakamura, Keisuke; Sugimoto, Tetsuya*; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Morishita, Yuki; Takasaki, Koji; Mitsuda, Kazuhisa*

no journal, , 

no abstracts in English

Oral presentation

High-resolution spectrometry of transuranium elements using the TES microcalorimeter

Nakamura, Keisuke; Sugimoto, Tetsuya*; Maehata, Keisuke*; Iyomoto, Naoko*; Ishibashi, Kenji*; Morishita, Yuki; Takasaki, Koji; Mitsuda, Kazuhisa*

no journal, , 

no abstracts in English

Oral presentation

Development of proton exchange membranes for hydriodic acid concentration by ion-track grafting technique

Tanaka, Nobuyuki; Sawada, Shinichi*; Sugimoto, Chihiro; Yamaki, Tetsuya*

no journal, , 

We have been developing the ion exchange membranes by a radiation grafted polymerization method to improve HI concentration performance for Electro-electrodialysis (EED) in the thermochemical water-splitting hydrogen production iodine-sulfur process. We verify to adopt the cation exchange membrane prepared by ion-track grafted technique. In this membrane preparation technique, one-dimensional cylindrical ion-channel can be formed in the base polymer film by the radiation of the heavy ion beam. And, the excess swelling of the ion-channel could be prevented, expecting that the HI concentration performance could be improved. In our works, The HI concentration experiment was conducted by the electric cell assembled the membrane prepared by the ion-track grafting technique. The HI composition of the tested solution increased, indicating that the tested membrane can operate HI concentration by EED.

Oral presentation

Development of proton exchange membranes for hydriodic acid concentration by ion-track grafting technique

Tanaka, Nobuyuki; Sawada, Shinichi*; Sugimoto, Chihiro; Yamaki, Tetsuya*

no journal, , 

We have been developing the ion exchange membranes by a radiation grafted polymerization method to improve HI concentration performance for Electro-electrodialysis (EED) in the thermochemical water-splitting hydrogen production iodine-sulfur process. We verify to adopt the cation exchange membrane prepared by ion-track grafted technique. In this membrane preparation technique, one-dimensional cylindrical ion-channel can be formed in the base polymer film by the radiation of the heavy ion beam. And, the excess swelling of the ion-channel could be prevented, expecting that the HI concentration performance could be improved. In our works. The HI concentration experiment was conducted by the electric cell assembled the membrane prepared by the ion-track grafting technique. The HI composition of the tested solution increased, indicating that the tested membrane can operate HI concentration by EED.

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