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Journal Articles

Secondary radiocesium contamination of agricultural products by resuspended matter

Nihei, Naoto*; Yoshimura, Kazuya; Okumura, Taiga*; Tanoi, Keitaro*; Iijima, Kazuki; Kogure, Toshihiro*; Nakanishi, Tomoko*

Journal of Radioanalytical and Nuclear Chemistry, 318(1), p.341 - 346, 2018/10

 Times Cited Count:1 Percentile:17.98(Chemistry, Analytical)

Journal Articles

Cesium adsorption/desorption behavior of clay minerals considering actual contamination conditions in Fukushima

Mukai, Hiroki*; Hirose, Atsushi*; Motai, Satoko*; Kikuchi, Ryosuke*; Tanoi, Keitaro*; Nakanishi, Tomoko*; Yaita, Tsuyoshi; Kogure, Toshihiro*

Scientific Reports (Internet), 6, p.21543_1 - 21543_7, 2016/02

 Times Cited Count:100 Percentile:97.28(Multidisciplinary Sciences)

Journal Articles

Tackling contamination of farmland by using NaI(Tl) spectrometer and gamma camera

Yin, Y.-G.; Suzui, Nobuo; Kawachi, Naoki; Yamaguchi, Mitsutaka; Tanoi, Keitaro*; Ishii, Satomi; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Watabe, Hiroshi*; et al.

Hoshasen To Sangyo, (133), p.45 - 48, 2012/12

no abstracts in English

Journal Articles

Development of grouting technologies for HLW disposal in Japan, 4; Planning and results of in-situ grouting test

Tanaka, Tatsuya*; Uyama, Masao*; Ishida, Tomoko*; Nakanishi, Tatsuro; Onishi, Yuzo*

Proceedings of 7th Asian Rock Mechanics Symposium (ARMS-7) (USB Flash Drive), p.702 - 711, 2012/10

This paper describes the planning, material selection, execution and interpretation of the grout injection test carried out at the end of 2011 at the Grimsel Test Site (GTS) in Switzerland as part of grouting technology project of the Japan Atomic Energy Agency (JAEA). Based on the findings of the rockmass characterization part of the GTS grouting study (Nakanishi et al, 2012, Bruines et al., 2012), it was decided to perform the grout injection test in a 5 m interval with the highest expected hydraulic conductivity. During the grouting test the viscosity of the grout was continuously measured. Both the injected volume and pressure in the injection section were recorded. In the observation sections the pressure over time as well as the electric conductivity, which can be used to measure the arrival of the higher salinity silica grout, was recorded. As the grout reached the observation sections before the grout hardened the grout injection test was a success. The gathered data of the grouting test presents an important data set for further modeling efforts of the grouting process.

Journal Articles

A Simple method for selective measurement of cesium 134 and cesium 137 by NaI(Tl) scintillation spectrometer

Yin, Y.-G.; Suzui, Nobuo; Yamaguchi, Mitsutaka; Kawachi, Naoki; Tanoi, Keitaro*; Nakanishi, Tomoko*; Chino, Mitsuo*; Nakamura, Shinichi*; Fujimaki, Shu

Nihon Dojo Hiryo Gaku Zasshi, 83(3), p.296 - 300, 2012/06

no abstracts in English

Journal Articles

Enhancement of plant growth stimulation activity of irradiated alginate by fractionation

Luan, L. Q.*; Nagasawa, Naotsugu; Ha, V. T. T.*; Hien, N. Q.*; Nakanishi, Tomoko*

Radiation Physics and Chemistry, 78(9), p.796 - 799, 2009/09

 Times Cited Count:14 Percentile:68.24(Chemistry, Physical)

Alginate with the weight-average molecular weight ($$M$$$$_{rm w}$$) approximately 900 kDa and ratio of M (mannuronate)/G (guluronate) about 1.3 was irradiated by $$gamma$$ Co-60 in aqueous solution at doses up to 200 kGy. The irradiation dose was shown to be a function for reducing $$M$$$$_{rm w}$$ and molecular weight distribution of irradiated alginates. The distribution of oligomer fractions in irradiated products was also investigated by separation using ultrafiltration membranes. The irradiated alginate with $$M$$$$_{rm w}$$ approximately 14.2 kDa was found to have a positive influence for growing of barley and soybean. The irradiated oligoalginate fraction with $$M$$$$_{rm w}$$ ranging from 1 to 3 kDa displayed the strongest effect on the growth and development of the mentioned plants at low concentration (20 ppm). It is suggested that oligoalginate with $$M$$$$_{rm w}$$ in the range 1-3 kDa is a trigger for the growth and development of plants.

Journal Articles

Dehydration process of fish analyzed by neutron beam imaging

Tanoi, Keitaro*; Hamada, Yosuke*; Seyama, Shohei*; Saito, Takayuki*; Iikura, Hiroshi; Nakanishi, Tomoko*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.179 - 184, 2009/06

 Times Cited Count:3 Percentile:29.44(Instruments & Instrumentation)

Journal Articles

New utilization and promotion of RI

Enomoto, Shuichi*; Kawamura, Hiroshi; Shirakawa, Yoshiyuki*; Nakanishi, Tomoko*; Nakamura, Kayoko*; Yano, Tsuneo*; Ido, Tatsuo*; Shibata, Tokushi

Isotope News, (657), p.2 - 11, 2009/01

The view of the future and the necessity of the system construction such as supply systems were shown about production of the medical diagnostics $$^{99}$$Mo and the silicon semiconductor on JMTR.

Journal Articles

The Effects of rhizosphere pH on Cd uptake of soybean seedlings

Oya, Tomoyuki*; Rai, Hiroki*; Tanoi, Keitaro*; Iikura, Hiroshi; Nakanishi, Tomoko*

Radioisotopes, 56(11), p.729 - 736, 2007/11

To study the effect of rhizosphere pH on the cadmium(Cd) uptake, soybean seedlings were grown for 4 days in 0.2 mM CaCl$$_{2}$$ solution containing 1 $$mu$$M Cd under pH 4.5 or pH 6.5 using $$^{109}$$Cd as a tracer. The concentration of Cd in root at pH 6.5 was 3.4 times higher than that at pH 4.5. Cadmium amount absorbed on root surface at pH 6.5 was 1.3 times higher than that at pH 4.5. With high accumulation of Cd in root, Cd toxicity such as brownish of the tissue and the suppression of lateral root development was only observed under pH 6.5 condition. Transpiration rate was found to have no relation to high accumulation of Cd in shoot.

Journal Articles

Enhancement of plant growth activity of irradiated alginate

Nagasawa, Naotsugu; Luan, L. Q.*; Yagi, Toshiaki; Yoshii, Fumio; Kume, Tamikazu; Nakanishi, Tomoko*; Tamada, Masao

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 55, 2007/02

The sodium alginate was irradiated by $$gamma$$-ray, and plant growth activity test and structural change of the product were studied. It was found that the concentration of 100 mg/L of alginate irradiated at 75 kGy in 4 % aqueous solution was the highest for plant growth. Separation of the degraded product was performed using ultrafiltration membranes and found that fraction with molecular weight in the range of 1-3 kDa (6-15 units) not only showed a remarkable effect on the plant growth, but also increased the activity of plant enzymes; ${it alcohol dehydrogenase, phenylalanine ammonia-lyase}$. This fraction was stronger than one of the enzymatic degradation product. This differences proposed formation of carbonyl and carboxyl groups along with the main-chain scission.

Journal Articles

Enhancement of plant growth activity of irradiated chitosan by molecular weight fractionation

Luan, L. Q.*; Nagasawa, Naotsugu; Tamada, Masao; Nakanishi, Tomoko*

Radioisotopes, 55(1), p.21 - 27, 2006/01

The chitosan products irradiated at 25 - 200 kGy in 10 % solution showed a positive effect on the growth of barley, while the unirradiated chitosan inhibited the growth of this plant. The 100 kGy irradiated chitosan product with average molecular weight (Mw) approx. 16 kDa was found as optimal to plant growth activity. Separation of the degraded samples was performed using ultrafiltaration membranes and was found that the fraction with Mw in range of 1-3 kDa. not only showed a remarkable effect on the growth of barley and soy bean, but also significantly increased the activity of phytoalexin enzymes, namely phenylalanine ammonia lyase (87 %) and chitinase (186 %). This fraction also increased 15.8 % seed yeild of soybean after three month cultivation.

Journal Articles

Biological effect of irradiated chitosan on plants ${it in vitro}$

Luan, L. Q.*; Ha, V. T. T.*; Nagasawa, Naotsugu; Kume, Tamikazu; Yoshii, Fumio; Nakanishi, Tomoko*

Biotechnology and Applied Biochemistry, 41(1), p.49 - 57, 2005/02

no abstracts in English

Journal Articles

Nondestructive elemental analysis using neutron

Matsue, Hideaki; Tanji, Akira; Miyata, Satoru; Yasuda, Ryo; Matsubayashi, Masahito; Nakanishi, Tomoko

Dai-5-Kai Hoshasen Ni Yoru Hihakai Hyoka Shimpojiumu Koen Rombunshu, p.45 - 48, 2005/02

no abstracts in English

Journal Articles

Activity for promotion of industrial applications of neutrons in Ibaraki prefecture, Study group for nondestructive analysis and imaging

Matsubayashi, Masahito; Yasuda, Ryo; Tanji, Akira; Miyata, Satoru; Matsue, Hideaki; Nakanishi, Tomoko

Dai-5-Kai Hoshasen Ni Yoru Hihakai Hyoka Shimpojiumu Koen Rombunshu, p.35 - 36, 2005/02

no abstracts in English

Journal Articles

Nondestructive observation of nuclear fuels and materials by using neutron radiography

Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Matsue, Hideaki; Nakanishi, Tomoko

Dai-5-Kai Hoshasen Ni Yoru Hihakai Hyoka Shimpojiumu Koen Rombunshu, p.31 - 34, 2005/02

Neutron radiography is an effectively nondestructive tool for inspection of irradiated nuclear fuels and materials. Neutron CT an neutron imaging plate methods, which are advanced techniques in the neutron radiography, enabled to obtain cross-section images and to evaluate an amount of the element compositions. This paper describes results of those methods using unirradiated fuels and materials and discussed the practicability of those methods to irradiated fuels and materials.

Journal Articles

Biological effect of radiation-degraded alginate on flower plants in tissue culture

Luan, L. Q.; Hien, N. Q.*; Nagasawa, Naotsugu; Kume, Tamikazu; Yoshii, Fumio; Nakanishi, Tomoko*

Biotechnology and Applied Biochemistry, 38(3), p.283 - 288, 2003/12

 Times Cited Count:32 Percentile:60.91(Biochemistry & Molecular Biology)

no abstracts in English

Journal Articles

Economic scale of utilization of radiation, 2; Agriculture: Comparison between Japan and U. S. A.

Kume, Tamikazu; Amano, Etsuo*; Nakanishi, Tomoko*; Chino, Mitsuo*

Journal of Nuclear Science and Technology, 39(10), p.1106 - 1113, 2002/10

 Times Cited Count:3 Percentile:24.34(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Pressure effect on antiferromagnetic ordering in UIn$$_3$$

Haga, Yoshinori; Honda, Fuminori*; Eto, Tetsujiro*; Omi, Gendo*; Kagayama, Tomoko*; Takeshita, Nao*; Mori, Nobuo*; Nakanishi, Takeshi*; Tokiwa, Yoshifumi*; Aoki, Dai*; et al.

Journal of the Physical Society of Japan, 71(8), p.2019 - 2021, 2002/08

 Times Cited Count:9 Percentile:53.59(Physics, Multidisciplinary)

Pressure phase diagram of the antiferromagnet UIn3 was constructed from the electrical resistivity measurement under high pressures up to 9 GPa. Neel temperature increases monotonically with increasing pressure from 88 K at ambient pressure to 127 K at 9 GPa. We observed an additional resistive anomaly at 21 K under 1.4 GPa. This anomaly brings about an increase of the residual resistivity. The transition temperature decreases gradually with increasing pressure and disappears around 8 GPa.

Journal Articles

Positron Emitting Tracer Imaging System (PETIS) as a tool for plant physiology

Mori, Satoshi*; Nakanishi, Tomoko*; Hayashi, Hiroaki*; Oyama, Takuji*; Uchida, Hiroshi*; Matsuhashi, Shimpei; Sekine, Toshiaki

Radioisotopes, 50(9), p.408 - 418, 2001/09

no abstracts in English

Journal Articles

Vanadium uptake and an effect of vanadium treatment on $$^{18}$$F-labeled water movement in a cowpea plant by positron emitting tracer imaging system (PETIS)

Furukawa, Jun*; Yokota, Harumi*; Tanoi, Keitaro*; Ueoka, Shiori*; Matsuhashi, Shimpei; Ishioka, Noriko; Watanabe, Satoshi; Uchida, Hiroshi*; Tsuji, Atsunori*; Ito, Takehito*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 249(2), p.495 - 498, 2001/08

 Times Cited Count:14 Percentile:70.96(Chemistry, Analytical)

We present real time Vanadate (V$$^{5+}$$) uptake imaging in a cowpea plant by Positron Emitting Tracer Imaging System (PETIS). Vanadium-48 was produced by bombarding a Sc foil target with 50 MeV $$alpha$$-particles at Takasaki Ion accelerators for Advanced Radiation Application (TIARA) AVF cyclotron. Then $$^{48}$$V was added to the culture solution to investigate the V distribution in a cowpea plant. The real time uptake of the $$^{48}$$V was monitored by PETIS. We measured the distribution of $$^{48}$$V in a whole plant after 3, 6 and 20 hours of V treatment by Bio-imaging Analyzer System (BAS). After the 20 hour treatment, vanadate was detected at the up-ground part of the plant. To know the effect of V uptake on plant activity, $$^{18}$$F-labeled water uptake was analyzed by PETIS. When a cowpea plant was treated with V for 20 hours before $$^{18}$$F-labeled water uptake experiment, the total amount of $$^{18}$$F-labeled water absorption was drastically desreased. Results suggest the inhibition of water uptake was mainly caused by the vanadate already moved to the up-ground part of the plant.

38 (Records 1-20 displayed on this page)