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Journal Articles

Autoradiography system with phosphor powder (ZnS:Ag) for imaging radioisotope dynamics in a living plant

Kurita, Keisuke; Sakai, Takuro; Suzui, Nobuo*; Yin, Y.-G.*; Sugita, Ryohei*; Kobayashi, Natsuko*; Tanoi, Keitaro*; Kawachi, Naoki*

Japanese Journal of Applied Physics, 60(11), p.116501_1 - 116501_4, 2021/11

 Times Cited Count:1 Percentile:39.19(Physics, Applied)

Radioisotope tracer imaging is useful for studying plant physiological phenomena. In this study, we developed an autoradiography system with phosphor powder (ZnS:Ag), "Live-autoradiography", for imaging radioisotope dynamics in a living plant. This system visualizes the element migration and accumulation in intact plants continuously under a light environment. An imaging test was performed on point sources of $$^{137}$$Cs, with a radioactivity of 10-100 kBq of being observed; this indicates satisfactory system linearity between the image intensity and the radioactivity of $$^{137}$$Cs. Moreover, dynamics imaging of $$^{137}$$Cs was performed on an intact soybean plant for four days. The serial images indicated $$^{137}$$Cs accumulation in the node, vein, and growing point of the plant. The developed system can be used for studying plant physiological phenomena and can be employed for quantitative measurement of radionuclides.

Journal Articles

Application of OpenPET as 3-D imaging device of carbon distribution in fruit

Kurita, Keisuke; Miyoshi, Yuta*; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.

QST-M-29; QST Takasaki Annual Report 2019, P. 106, 2021/03

Journal Articles

Neutron Radiography Facility; TNRF and CNRF

Kurita, Keisuke; Iikura, Hiroshi

Hamon, 31(1), p.11 - 13, 2021/02

no abstracts in English

Journal Articles

A Sensitive method for Sr-90 analysis by accelerator mass spectrometry

Sasa, Kimikazu*; Honda, Maki; Hosoya, Seiji*; Takahashi, Tsutomu*; Takano, Kenta*; Ochiai, Yuta*; Sakaguchi, Aya*; Kurita, Saori*; Satou, Yukihiko; Sueki, Keisuke*

Journal of Nuclear Science and Technology, 58(1), p.72 - 79, 2021/01

 Times Cited Count:3 Percentile:59.68(Nuclear Science & Technology)

Journal Articles

Non-invasive imaging of radiocesium dynamics in a living animal using a positron-emitting $$^{127}$$Cs tracer

Suzui, Nobuo*; Shibata, Takuya; Yin, Y.-G.*; Funaki, Yoshihito*; Kurita, Keisuke; Hoshina, Hiroyuki*; Yamaguchi, Mitsutaka*; Fujimaki, Shu*; Seko, Noriaki*; Watabe, Hiroshi*; et al.

Scientific Reports (Internet), 10, p.16155_1 - 16155_9, 2020/10

 Times Cited Count:0 Percentile:0.01(Multidisciplinary Sciences)

Journal Articles

Transient ionization of the mesosphere during auroral breakup; Arase satellite and ground-based conjugate observations at Syowa Station

Kataoka, Ryuho*; Nishiyama, Takanori*; Tanaka, Yoshimasa*; Kadokura, Akira*; Uchida, Herbert Akihito*; Ebihara, Yusuke*; Ejiri, Mitsumu*; Tomikawa, Yoshihiro*; Tsutsumi, Masaki*; Sato, Kaoru*; et al.

Earth, Planets and Space (Internet), 71, p.9_1 - 9_10, 2019/01

 Times Cited Count:7 Percentile:48.49(Geosciences, Multidisciplinary)

Transient ionization of the mesosphere was detected at around 65 km altitude during the isolated auroral expansion occurred at 2221-2226 UT on June 30, 2017. A general-purpose Monte Carlo particle transport code PHITS suggested that significant ionization is possible in the middle atmosphere due to auroral X-rays from the auroral electrons of $$<$$10 keV.

Journal Articles

Physical design of JT-60 Super Upgrade

Nagashima, Keisuke; Kikuchi, Mitsuru; Kurita, Genichi; Ozeki, Takahisa; Aoyagi, Tetsuo; Ushigusa, Kenkichi; Neyatani, Yuzuru; Kubo, Hirotaka; Mori, Kensuke*; Nakagawa, Shoji*; et al.

Fusion Engineering and Design, 36(2-3), p.325 - 342, 1997/05

 Times Cited Count:1 Percentile:14.87(Nuclear Science & Technology)

no abstracts in English

Oral presentation

Critical beta analyses of low aspect ratio tokamak

Kurita, Genichi; Aiba, Nobuyuki; Tobita, Kenji; Nishio, Satoshi; Nagashima, Keisuke

no journal, , 

We obtain the critical beta for the up-down symmetric double-null equilibria against the position of conformal conducting wall in two cases; one is fixed plasma current profile case and another is varied plasma current profile case taking a bootstrap current into account. To obtain normalized beta value, bN=4.3, assumed in Slim-CS tokamak, we must put the conducting wall at r=1.2a and r=1.34a, where a is the plasma minor radius, for former and latter cases, respectively. The advantage of latter case comes from the higher minimum safety factor value due to larger plasma bootstrap current derived by the increased plasma pressure. If we consider the effect of edge pedestal plasma pressure, the critical beta can be increased. In this study, only the n=1 mode, which is considered to be most dangerous one, is investigated.

Oral presentation

Critical beta analyses of low aspect ratio tokamak, 2

Kurita, Genichi; Tobita, Kenji; Asakura, Nobuyuki; Aiba, Nobuyuki; Nagashima, Keisuke

no journal, , 

It is necessary to obtain the stable high beta plasma in order to realize the economically superior magnetically confined fusion reactor. In these analyses, we mainly investigate the effect of plasma pressure pedestal near plasma edge region considering the bootstrap current effect due to edge plasma pressure pedestal. The following results are obtained. Increase of edge plasma pressure induces a rise of critical beta because of reduction of internal plasma pressure gradient, until the edge plasma pressure gradient and bootstrap current induces the new instability near the plasma edge. For comparatively peaked plasma pressure profiles, we have another higher door-knob like stable region near the maximum critical beta region.

Oral presentation

Systematic evaluation of cultivation using plant radiotracer imaging techniques; For establishment of "Nuclear Agriculture"

Fujimaki, Shu; Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Yin, Y.-G.; Kurita, Keisuke

no journal, , 

no abstracts in English

Oral presentation

Non-invasive imaging of sodium and zinc in intact plants using commercially available radioisotopes

Suzui, Nobuo; Yin, Y.-G.; Ishii, Satomi; Kurita, Keisuke; Kawachi, Naoki; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Response of Arabidopsis mutants which lack genes involved in carbon storage to high CO$$_{2}$$ concentration environment

Ishii, Yohei*; Suzui, Nobuo; Kawachi, Naoki; Yin, Y.-G.; Ishii, Satomi; Kurita, Keisuke; Fujimaki, Shu; Kusano, Hiroaki*; Shimada, Hiroaki*

no journal, , 

no abstracts in English

Oral presentation

Developments of radiotracer imaging technologies for the purpose of plant researches

Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Yin, Y.-G.; Kurita, Keisuke; Ishii, Yohei*; Shimada, Hiroaki*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Visualization of secretion from soybean root using a positron-emitting tracer imaging system (PETIS)

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Kurita, Keisuke; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Imaging of element dynamics in plant with Cherenkov light

Kurita, Keisuke; Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Development of an imaging technology for plant with Cherenkov light

Kurita, Keisuke; Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Development of the plant Cherenkov imaging technology for dynamic analysis of radioactive cesium

Kurita, Keisuke; Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Visualization and quantitative analysis of secretions from soybean root, 2; Comparison of distribution of the secretions in different culture medium

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Ishii, Satomi; Kurita, Keisuke; Nakamura, Takuji*; Shinano, Takuro*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Development of plant radioisotope imaging technology using Cherenkov light

Kurita, Keisuke; Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

no journal, , 

no abstracts in English

Oral presentation

Development of a quantification technology of the plant Cherenkov imaging

Kurita, Keisuke; Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu

no journal, , 

no abstracts in English

36 (Records 1-20 displayed on this page)