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Oral presentation

Medical radioisotope production with accelerator neutrons by 40 MeV deuterons

Tsukada, Kazuaki; Sato, Nozomi; Watanabe, Satoshi; Ishioka, Noriko; Hatsukawa, Yuichi; Hashimoto, Kazuyuki; Kin, Tadahiro*; Kawabata, Masako; Saeki, Hideya; Nagai, Yasuki

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Alpha-ray measurement of dissolved plutonium particle on the TIMS filament

Yasuda, Kenichiro; Suzuki, Daisuke; Kanazawa, Kazuhito; Miyamoto, Yutaka; Esaka, Fumitaka; Magara, Masaaki

no journal, , 

In order to detect of undeclared activities in nuclear facilities, we develop to technique of safeguards environmental sample analysis in JAEA. As part of this effort, isotope ratio analysis of individual MOX particle was performed using by TIMS without chemical treatment. It is possible to estimate an age determination of plutonium purification by a combination of the plutonium isotope ratios and (Pu-238+Am-241)/(Pu-239+Pu-240) alpha activity ratios were obtained by the alpha spectrometry. Since the plutonium particle size is more than 1$$mu$$m due to the influence of self-absorption, exactly measurement of the activity ratios has been difficult. Therefore, we were examining how to acid dissolution in the plutonium particles on the TIMS filament before alpha spectrometry.

Oral presentation

Oral presentation

Sequential separation of ultra-trace multi-elements including Pu

Miyamoto, Yutaka; Yasuda, Kenichiro; Magara, Masaaki

no journal, , 

The authors accomplished the development of technique for sequential separation of U, Th, Pb, and the lanthanides using a single anion-exchange column and mixed media consisting of hydrochloric acid, nitric acid, acetic acid, and hydrofluoric acid in the previous work. Composition of eluents for separation of Pu and Th was optimized to accomplish the sequential separation of multi-elements including Pu. The mixture of Pu and Th was successfully separated by a single anion exchange column with acetic acid-HCl-HF mixed-media.

Oral presentation

EEC radon in underground research facilities

Furuta, Sadaaki; Ikeda, Koki; Mikake, Shinichiro; Imaeda, Yasuhiro; Nagasaki, Yasushi; Suzuki, Hajime; Nomura, Yukihiro

no journal, , 

no abstracts in English

Oral presentation

Fluvial discharges of particulate and dissolved radiocesium from a forest catchment

Takeuchi, Erina; Atarashi-Andoh, Mariko; Nishimura, Shusaku; Nakanishi, Takahiro; Tsuzuki, Katsunori; Koarashi, Jun; Matsunaga, Takeshi

no journal, , 

no abstracts in English

Oral presentation

Selection of regents for measurement of low concentrations of $$^{10}$$Be and $$^{26}$$Al by AMS

Kokubu, Yoko; Matsubara, Akihiro; Fujita, Natsuko; Nishio, Tomohiro*; Owaki, Yoshio*; Sanada, Katsuki*; Nishizawa, Akimitsu*; Miyake, Masayasu*

no journal, , 

Cosmogenic nuclides of $$^{10}$$Be and $$^{26}$$Al are used for studies such as estimation of exposure age and erosion rate of rock. In order to measure traces of $$^{10}$$Be and $$^{26}$$Al by accelerator mass spectrometry (AMS) in these studies, reagents with low levels of $$^{10}$$Be and $$^{26}$$Al are needed. In this study, ratios of $$^{10}$$Be/$$^{9}$$Be or $$^{26}$$Al/$$^{27}$$Al in several reagents were compared. The reagents were oxides for evaluation of blank in measurement and standard solutions for atomic absorption spectrometry (AAS) or inductively coupled plasma optical emission / mass spectrometry (ICP) for carrier and evaluation of process blank. The ratios were measured in JAEA-AMS-TONO. The ratios of $$^{10}$$Be/$$^{9}$$Be in the Be oxides and the Be standard solutions were approximately 10$$^{-14}$$$$sim$$10$$^{-15}$$ levels. The Be Standard solutions for AAS and ICP supplied by Merck had lower ratios of $$^{10}$$Be/$$^{9}$$Be than those supplied by Wako and Kanto chemical.

Oral presentation

Application of pulsed optically stimulated luminescence using natural mineral to retrospective dosimetry

Fujita, Hiroki

no journal, , 

Optically stimulated luminescence (OSL) from natural quartz and feldspar has been used in retrospective dosimetry, dating of sediment and etc. However, in the application target mineral should be extracted with chemical separation which is robust work. Now a days, pulsed optically stimulated luminescence (P-OSL) was developed to separate luminescence signal from between quartz and feldspar as instrumental separation. The purpose of this study tried to apply the P-OSL to Japanese surface soil as retrospective dosimetry with easy physical separation. From our results, it was concluded that P-OSL dosimetry is suitable for accident evaluation although further research is required to improve the protocol using various kinds of Japanese surface soils.

Oral presentation

Properties and distribution of radioactive caesium of the surface soil of Japanese cedar forest in Fukushima

Ishii, Yasuo; Sasaki, Yoshito; Kikuchi, Naoyuki; Watanabe, Takayoshi; Oda, Yoshihiro; Niizato, Tadafumi

no journal, , 

As part of "Long-Term Assessment of Transport of Radioactive Contaminant in the Environment of Fukushima" (F-TRACE project), JAEA have researched to expect the transportation of radioactive caesium from contaminated mountain forests to estuary and coast through dam, pond, river etc. based on survey data in Fukushima prefecture, and to implement technical information and remedial measures to prevent contamination of decontaminated areas and domestic water supply. In the forest area, it is considered that radioactive caesium existed in the tree canopies move to the surface of the ground through litter fall, through fall and stem flow. In this study, we report properties and distribution of radioactive caesium of the surface soils at stem base of Japanese cedar in the Ogi district of Kawauchi-mura to know the influence of the stem flow on soil.

Oral presentation

Transport of radionuclides to soil at Fukushima Daiichi NPS, TEPCO

Koma, Yoshikazu

no journal, , 

Due to the accident of Fukushima Daiichi NPS, TEPCO, wide area was contaminated. TEPCO analyzed radioactivity in the soil within the NPS site and reported their concentration in 2011. Based on the data disclosed, transport behavior from the fuel of damaged reactors to the soil for the detected radionuclides was investigated.

Oral presentation

Analysis of $$^{93}$$Zr in the contaminated water generated at the Fukushima Daiichi Nuclear Power Station

Shimada, Asako; Kameo, Yutaka

no journal, , 

no abstracts in English

Oral presentation

Establishment of analytical method for technetium-99 in soil

Inoue, Kazumi; Fujita, Hiroki; Hatsukawa, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Application of ICP-MS to determination of $$^{129}$$I in field soil around Tokai Reprocessing Plant

Nagaoka, Mika; Yokoyama, Hiroya; Fujita, Hiroki

no journal, , 

no abstracts in English

Oral presentation

Isolation of At-211 from an irradiated Bi target using a wet chemistry approach

Watanabe, Shigeki; Balkin, E. R.*; Hamlin, D. K.*; Gagnon, K.*; Chyan, M.-K.*; Wilbur, D. S.*

no journal, , 

no abstracts in English

Oral presentation

Mass asymmetric fission of a nucleus produced in the $$^{7}$$Li + $$^{186}$$W reaction

Tamura, Nobuyuki; Hirose, Kentaro; Nishio, Katsuhisa; Nishinaka, Ichiro; Makii, Hiroyuki; Orlandi, R.; L$'e$guillon, R.; Smallcombe, J.; Andreyev, A.; Otsuki, Tsutomu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Simultaneous measurement of fission and capture cross sections for minor actinide nuclei

Tamura, Nobuyuki; Nishio, Katsuhisa; Hirose, Kentaro; Nishinaka, Ichiro; Makii, Hiroyuki; Kimura, Atsushi; Ota, Shuya*; Andreyev, A.; Vermeulen, M.*; Gillespire, S.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Synthesis of endohedral 85-Sr metallofullerene by nuclear recoil using high energy neutron

Miyashita, Yuka*; Akiyama, Kazuhiko*; Hatsukawa, Yuichi; Tadai, Tomohiro*; Chiba, Kazuki*; Sato, Yuta*; Kubuki, Shiro*

no journal, , 

To obtain an endohedral metallofullerenes with high specific radioactivity using nuclear recoil phenomena, many experiments have been performed so far. However, production yield of metallofullerene by nuclear recoil using high LET radiation was found to be very small because radiation damages to targeted fullerene molecule were not negligible. In order to increase the yield of radioactive metallofullerenes, it is very promising to employ the recoil of nuclear reaction by fast neutron from the viewpoint of reducing the radiation damage. In this session, we will report the synthesis of $$^{85}$$Sr@C$$_{60}$$ using nuclear recoil of $$^{86}$$Sr (n,2n) $$^{85}$$Sr reaction by 14 MeV fast neutron. Mixture of C$$_{60}$$ with strontium salts such as Sr(NO$$_{3}$$)$$_{2}$$ and SrC$$_{2}$$O$$_{4}$$ were employed for the target materials. These samples were irradiated by fast neutron in Fusion Neutronics Source at Japan Atomic Energy Agency. After the irradiation, CS$$_{2}$$, aniline, and HCl$$_{aq}$$ were passed through the irradiated samples on the filter to dissolve C$$_{60}$$, Sr@C$$_{60}$$, and strontium salts, respectively. The $$gamma$$-ray from these solutions were measured by Ge detector. As a result, about 0.75% of radioactivity was observed in the aniline solution from SrC$$_{2}$$O$$_{4}$$ sample. This result strongly suggests that Sr@C$$_{60}$$ was efficiently produced by fast neutron irradiation of SrC$$_{2}$$O$$_{4}$$/C$$_{60}$$ target.

Oral presentation

Retention characteristics of radiocaesium in lichens and their applicability as fall-out indicator

Dohi, Terumi; Omura, Yoshihito*; Fujiwara, Kenso; Iijima, Kazuki

no journal, , 

Lichens are symbiotic organisms consisted of fungi and algae. A number of studies were carried out after the nuclear weapons tests and Chernobyl accident, and demonstrated that lichens were useful for indicator of radioactive fallout because they could take up large amount of radionuclides directly from their thallus due to lack of root system and retain them. However, in order to measure radiocaesium concentration in lichen, the lichen sample was collected from their habitat. Therefore, temporal change of radiocaesium concentration in same lichen individual has never reported. In addition, a retention of radiocaesium in lichens in Japan was unknown. The objective of this study is to investigate the temporal change of radiocaesium concentration in individual lichen. Lichen samples were parmelioid lichens which were grown on the trunk of Prunus spp. within Fukushima prefecture. The counting rate of surface of lichen was measured by using Geiger-Mueller (GM) survey meter with a lead collimator to evaluate the radiocaesium concentration. The contamination density in lichens increased from the initial measurement value after one year. It is considered that lichen may receive radiocaesium from stem flow including radiocaesium desorbed from canopy or stem.

Oral presentation

Electrolytic reduction of Mo and W as lighter homologues of seaborgium

Toyoshima, Atsushi; Miyashita, Sunao*; Oe, Kazuhiro*; Kitayama, Yuta*; Lerum, H. V.*; Goto, Naoya*; Kaneya, Yusuke; Komori, Yukiko*; Mitsukai, Akina*; Vascon, A.; et al.

no journal, , 

no abstracts in English

29 (Records 1-20 displayed on this page)