JOPSS - Search Results

Journal Articles

RBPO $_{5}$ (R=Ca, Sr)-based storage phosphors for neutron detection

Sakasai, Kaoru; Katagiri, Masaki; Matsubayashi, Masahito; Nakamura, Tatsuya; Kondo, Yasuhiro*

IEEE Transactions on Nuclear Science, 52(5), p.1856 - 1859, 2005/10

https://doi.org/10.1109/TNS.2005.856617

Times Cited Count：9 Percentile：52.06(Engineering, Electrical & Electronic)

Storage characteristics of RBPO $_{5}$ (R=Ca, Sr) based phosphors have been investigated for neutron detection. To increase the photostimulated luminescence (PSL) yields of CaBPO $_{5}$ :Ce $^{3+}$ and SrBPO $_{5}$ :Ce $^{3+}$ phosphors, fluorine atoms were introduced and the molar ratio of the fluorine atoms was optimized for the PSL yields. In addition, the authors found that the PSL yields of SrBPO $_{5}$ :Eu $^{2+}$ phosphors were significantly increased by adding Li $_{2}$ B $_{4}$ O $_{7}$ , though introducing fluorine and brome atoms in the phosphor was not effective for the PSL yields. These phosphors will be usable as new neutron storage phosphors with low -ray sensitivity because they consist of light materials.

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

https://doi.org/10.1023/A:1013276224300

Times Cited Count：16 Percentile：72.58(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 -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

https://doi.org/10.1023/A:1013217425209

We present the water uptake ability of cowpea () 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

https://doi.org/10.3769/radioisotopes.50.265

$^{15}$ 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(,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 cm15 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.