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Journal Articles

Development of spin-contrast-variation neutron powder diffractometry for extracting the structure factor of hydrogen atoms

Miura, Daisuke*; Kumada, Takayuki; Sekine, Yurina; Motokawa, Ryuhei; Nakagawa, Hiroshi; Oba, Yojiro; Ohara, Takashi; Takata, Shinichi; Hiroi, Kosuke; Morikawa, Toshiaki*; et al.

Journal of Applied Crystallography, 54(2), p.454 - 460, 2021/04

 Times Cited Count:0 Percentile:0.02(Chemistry, Multidisciplinary)

We developed a spin-contrast-variation neutron powder diffractometry technique that extracts the structure factor of hydrogen atoms, namely, the contribution of hydrogen atoms to a crystal structure factor. Crystals of L-glutamic acid were dispersed in a dpolystyrene matrix containing 4-methacryloyloxy-2,2,6,6,-tetramethyl-1-piperidinyloxy (TEMPO methacrylate) to polarize their proton spins dynamically. The intensities of the diffraction peaks of the sample changed according to the proton polarization, and the structure factor of the hydrogen atoms was extracted from the proton-polarization dependent intensities. This technique is expected to enable analyses of the structures of hydrogen-containing materials that are difficult to determine with conventional powder diffractometry.

JAEA Reports

Evaluation of irradiation behavior on oxide dispersion strengthened (ODS) steel claddings irradiated in Joyo/CMIR-6

Yano, Yasuhide; Otsuka, Satoshi; Yamashita, Shinichiro; Ogawa, Ryuichiro; Sekine, Manabu; Endo, Toshiaki; Yamagata, Ichiro; Sekio, Yoshihiro; Tanno, Takashi; Uwaba, Tomoyuki; et al.

JAEA-Research 2013-030, 57 Pages, 2013/11

JAEA-Research-2013-030.pdf:48.2MB

It is necessary to develop the fast reactor core materials, which can achieve high-burnup operation improving safety and economical performance. Ferritic steels are expected to be good candidate core materials to achieve this objective because of their excellent void swelling resistance. Therefore, oxide dispersion strengthened (ODS) ferritic steel and 11Cr-ferritic/martensitic steel (PNC-FMS) have been respectively developed for cladding and wrapper tube materials in Japan Atomic Energy Agency. In this study, the effects of fast neutron irradiation on mechanical properties and microstructure of 9Cr-and 12Cr-ODS steel claddings for fast reactor were investigated. Specimens were irradiated in the experimental fast reactor Joyo using the CMIR-6 at temperatures between 420 and 835$$^{circ}$$C to fast neutron doses ranging from 16 to 33 dpa. The post-irradiation ring tensile tests were carried out at irradiation temperatures.

JAEA Reports

Periodic safety review of the experimental fast reactor JOYO; Review of the activity for safety

Maeda, Yukimoto; Kashimura, Yoichi; Suzuki, Toshiaki; Isozaki, Kazunori; Hoshiba, Hideaki; Kitamura, Ryoichi; Nakano, Tomoyuki; Takamatsu, Misao; Sekine, Takashi

JNC TN9440 2005-001, 540 Pages, 2005/02

JNC-TN9440-2005-001.pdf:8.35MB

Periodic safety review (Review of the activity for safety) which consisted of "Comprehensive evaluation of operation experience" and "Incorporation of the latest technical knowledge" was carried out up to January 2005.

Journal Articles

Development of positron-emitting bromine nuclides production using an isotope separator

Fateh, B.; Ishioka, Noriko; Watanabe, Satoshi; Kume, Tamikazu; Sekine, Toshiaki*

JAERI-Review 2003-033, TIARA Annual Report 2002, p.259 - 261, 2003/11

no abstracts in English

Journal Articles

A Laser ion source with a thin ohmic-heating ionizer for the TIARA-ISOL

Koizumi, Mitsuo; Osa, Akihiko; Oshima, Masumi; Sekine, Toshiaki; Wakui, Takashi*; Jin, W.*; Katsuragawa, H.*; Miyatake, Hiroari*; Ishida, Yoshihisa*

Nuclear Instruments and Methods in Physics Research B, 204(1-4), p.359 - 362, 2003/05

 Times Cited Count:7 Percentile:47.94(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Dose dependence of the production yield of endohedral $$^{133}$$Xe-fullerene by ion implantation

Watanabe, Satoshi; Ishioka, Noriko; Shimomura, Haruhiko*; Muramatsu, Hisakazu*; Sekine, Toshiaki

Nuclear Instruments and Methods in Physics Research B, 206(1-4), p.399 - 402, 2003/05

 Times Cited Count:8 Percentile:51.59(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Production of endohedral $$^{133}$$Xe-fullerene by ion implantation

Watanabe, Satoshi; Ishioka, Noriko; Sekine, Toshiaki; Osa, Akihiko; Koizumi, Mitsuo; Shimomura, Haruhiko*; Yoshikawa, K.*; Muramatsu, Hisakazu*

Journal of Radioanalytical and Nuclear Chemistry, 255(3), p.495 - 498, 2003/03

 Times Cited Count:11 Percentile:61.24(Chemistry, Analytical)

no abstracts in English

Journal Articles

A History of the universe continuing in our body

Sekine, Toshiaki

Jomo Shimbun, P. 9, 2003/01

This paper is written as one of the series on a news paper relevant to the Gunma Chemistry Exhibition to be held in commemoration of the 125th anniversary of the Chemical Society of Japan, telling readers that the origin of chemical elements is related to the radiation. As an example, K-40 is chosen for description of the fact that there exist natural radioactive elements. It is also mentioned that the origin of K-40 is ascribable to stars in the universe.

Journal Articles

Transfer function analysis of positron-emitting tracer imaging system (PETIS) data

Keutgen, N.; Matsuhashi, Shimpei; Mizuniwa, Chizuko; Ito, Takehito*; Fujimura, Takashi; Ishioka, Noriko; Watanabe, Satoshi; Sekine, Toshiaki; Uchida, Hiroshi*; Hashimoto, Shoji

Applied Radiation and Isotopes, 57(2), p.225 - 233, 2002/09

 Times Cited Count:9 Percentile:53.47(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Excitation functions of rhenium isotopes on the $$^{nat.}$$W(d,xn) reactions and production of no-carrier-added $$^{186}$$Re

Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko; Koizumi, Mitsuo; Matsuoka, Hiromitsu; Sekine, Toshiaki

Journal of Nuclear Science and Technology, 39(Suppl.2), p.1334 - 1337, 2002/08

Experimental cross sections for the reactions $$^{186}$$W(d,2n)$$^{186}$$Re, $$^{nat.}$$W(d,xn)$$^{181-184}$$Re and $$^{186}$$W(d,p)$$^{187}$$W are measured up to 34 MeV using the stacked foil method. The values obtained are compared with cross sections calculated using the ALICE code. The experimental and theoretical excitation functions are in reasonable agreement except for the $$^{186}$$W(d,p)$$^{187}$$W reaction.

Journal Articles

Production of positron emitters of metallic elements to study plant uptake and distribution

Watanabe, Satoshi; Ishioka, Noriko; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki; Kiyomiya, Shoichiro*; Nakanishi, Hiromi*; Mori, Satoshi*

Radiochimica Acta, 89(11-12), p.853 - 858, 2002/02

 Times Cited Count:17 Percentile:76.5(Chemistry, Inorganic & Nuclear)

no abstracts in English

JAEA Reports

Production of $$^{139}$$Ce by the $$^{139}$$La(p,n)$$^{139}$$Ce reaction

Ishioka, Noriko; Izumo, Mishiroku; Hashimoto, Kazuyuki; Kobayashi, Katsutoshi; Matsuoka, Hiromitsu; Sekine, Toshiaki

JAERI-Tech 2001-095, 23 Pages, 2002/01

JAERI-Tech-2001-095.pdf:1.1MB

no abstracts in English

Journal Articles

Real-time [$$^{11}$$C]methionine translocation in barley in relation to mugineic acid phytosiderophore biosynthesis

Bughio, N.*; Nakanishi, Hiromi*; Kiyomiya, Shoichiro*; Matsuhashi, Shimpei; Ishioka, Noriko; Watanabe, Satoshi; Uchida, Hiroshi*; Tsuji, Atsunori*; Osa, Akihiko; Kume, Tamikazu; et al.

Planta, 213(5), p.708 - 715, 2001/09

 Times Cited Count:16 Percentile:39.17(Plant Sciences)

[$$^{11}$$C]Methionine ([$$^{11}$$C]Met) was supplied through barley roots and the $$^{11}$$C signal was follwoed using a real-time imaging system (PETIS), with subsequent development of autoradiographic images of the whole plant. In all cases, [$$^{11}$$C]Met was first translocated to the discrimination center, and this part was strongly labeled. Met absorbed by roots of the plants was subsequently translocated to other parts of the plant. In Fe-deficient (-Fe) barley plants, a drastic reduction in [$$^{11}$$C]Met translocation from the roots to the shoot was observed, while a greater amount of $$^{11}$$C was found in the leaves of Fe-sufficient or Met-pretreated -Fe plants. Treatment of -Fe plants with amiooxyacetic acid increased the translocation of [$$^{11}$$C]Met to the shoot. The retention of exogenously supplied [$$^{11}$$C]Met in the roots of -Fe barley indicates that the Met is used in the biosynthesis of mugineic acid (MA) in barley roots. This and the absence of Met movement from shoots to the roots suggest that the MA phytosiderophores precursor Met originates in the roots of plants.

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.

Journal Articles

$$^{18}$$F used as tracer to study water uptake and transport imaging of a cowpea plant

Nakanishi, Tomoko*; Tanoi, Keitaro*; Yokota, Harumi*; Kang, D.-J.*; Ishii, Ryuichi*; Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko; Sekine, Toshiaki; Matsuhashi, Shimpei; et al.

Journal of Radioanalytical and Nuclear Chemistry, 249(2), p.503 - 507, 2001/08

We present the water uptake ability of cowpea ($$it {Vigna unguliculata Walp.}$$) which has been regarded as one of the most drought resistant species among the pulse crops. It has been suggested that in the lower part of the stem, parenchymatous tissue for storing water had been developed for the function of deought resistance. We confirmed that in this tissue, water amount was high compared to the other stems by neutron radiography. Then the water uptake manner was measured by positron emitting tracer imaging system (PETIS) using $$^{18}$$F labeled water produced by a cyclotron. Comparing the water uptake manner of cowpea plant with that of common bean, cowpea plant was found to maintain high water uptake activity after drying treatment, suggesting the high drought resistant character.

Journal Articles

Comparison of $$^{15}$$O-labeled and $$^{18}$$F-labeled water uptake in a soybean plant by PETIS (Positron Emitting Tracer Imaging System)

Nakanishi, Tomoko*; Yokota, Harumi*; Tanoi, Keitaro*; Ikeue, Natsuko*; Okuni, Yoko*; Furukawa, Jun*; Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko; Sekine, Toshiaki; et al.

Radioisotopes, 50(6), p.265 - 269, 2001/06

$$^{15}$$O-Labeled and $$^{18}$$F-Labeled water uptake manner in a soybean plant was compared by PETIS (Positron Emitting Tracer Imaging System). $$^{15}$$O-Labeled water (half-life: 2 min) and $$^{18}$$F-Labeled water (half-life: 110 min) were produced by a cyclotron by $$^{14}$$N(d,n)$$^{15}$$O and $$^{16}$$O($$alpha$$,pn)$$^{18}$$F reactions, respectively. A root of a soybean plant was cut off and each labeled water was supplied from the basal part of the plant. The gamma-rays emitted from the sample was measured by a BGO counter with a detection area of 5 cm$$times$$15 cm. The radioactivity from each stem was accumlated every 15 s till 20 min. It was found that $$^{18}$$F-labeled water was taken up much faster than $$^{15}$$O-labeled water, suggesting that in $$^{18}$$F-labeled water, fluorine was moved in the form of $$^{18}$$F-ion. When BAS image of $$^{15}$$O-labeled water in a plant after 5 min and 10 min of water supply was taken, it was found that the labeled water was observed only in the lowest internode, between a root and the first leaves.

Journal Articles

Normalization of $$gamma$$-$$gamma$$ angular correlation coincidence counts using characteristic X-rays

Asai, Masato*; Kawade, Kiyoshi*; Shibata, Michihiro*; Kojima, Yasuaki*; Osa, Akihiko; Koizumi, Mitsuo; Sekine, Toshiaki

Nuclear Instruments and Methods in Physics Research A, 463(1-2), p.205 - 212, 2001/05

 Times Cited Count:2 Percentile:21.52(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Visualization of $$^{15}$$O-water flow in tomato and rice in the light and dark using a positron-emitting tracer imaging system (PETIS)

Mori, Satoshi*; Kiyomiya, Shoichiro*; Nakanishi, Hiromi*; Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko; Matsuhashi, Shimpei; Hashimoto, Shoji; Sekine, Toshiaki; Uchida, Hiroshi*; et al.

Soil Science and Plant Nutrition, 46(4), p.975 - 979, 2000/12

 Times Cited Count:29 Percentile:59.94(Plant Sciences)

no abstracts in English

Journal Articles

The Principle in the use of positron-emitting nuclides

Sekine, Toshiaki

Nihon Dojo Hiryo Gaku Zasshi, 71(6), p.928 - 929, 2000/11

no abstracts in English

103 (Records 1-20 displayed on this page)