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Journal Articles

Distribution of the $$^{134}$$Cs/$$^{137}$$Cs ratio around the Fukushima Daiichi Nuclear Power Plant using an unmanned helicopter radiation monitoring system

Nishizawa, Yukiyasu; Yoshida, Mami; Sanada, Yukihisa; Torii, Tatsuo

Journal of Nuclear Science and Technology, 53(4), p.468 - 474, 2016/04

 Times Cited Count:19 Percentile:93.42(Nuclear Science & Technology)

JAEA Reports

Radiation monitoring using manned helicopter around the Fukushima Daiichi Nuclear Power Station in the fiscal year 2014 (Contract research)

Sanada, Yukihisa; Mori, Airi; Ishizaki, Azusa; Munakata, Masahiro; Nakayama, Shinichi; Nishizawa, Yukiyasu; Urabe, Yoshimi; Nakanishi, Chika; Yamada, Tsutomu; Ishida, Mutsushi; et al.

JAEA-Research 2015-006, 81 Pages, 2015/07

JAEA-Research-2015-006.pdf:22.96MB

By the nuclear disaster of Fukushima Daiichi Nuclear Power Station (NPS), Tokyo Electric Power Company (TEPCO), caused by the East Japan earthquake and the following tsunami occurred on March 11, 2011, a large amount of radioactive materials was released from the NPP. These results of the aerial radiation monitoring using the manned helicopter in the fiscal 2014 were summarized in the report.

JAEA Reports

Report for "FY 2013 Evaluation of Decontamination Technology Demonstrations Projects for the environmental remediation with radioactive materials discharged from the Fukushima Daiichi Nuclear Power Plant Accident" (Contract research)

Watanabe, Masahisa; Tagawa, Akihiro; Umemiya, Noriko; Maruyama, Noboru; Yoshida, Mami; Kawase, Keiichi; Noguchi, Shinichi; Sakazume, Yoshinori; Watanabe, Masanori; Hiraga, Hayato; et al.

JAEA-Review 2014-028, 184 Pages, 2014/10

JAEA-Review-2014-028.pdf:37.79MB

JAEA received technical proposals from private enterprise about techniques that can be used for decontamination work, and "Decontamination Technology Demonstrations Projects" was commissioned from the Ministry of the Environment to verifies the decontamination effect, economy feasibility, safety, and other factors. By the "FY 2013 Decontamination Technology Demonstrations Projects" JAEA carried out technical advice of demonstration test and evaluation of 11 technologies (e.g., decontamination of soils and green space and wastes and washing of fly ash).

Journal Articles

27th report of ITPA topical group meeting

Osakabe, Masaki*; Shinohara, Koji; Toi, Kazuo*; Todo, Yasushi*; Hamamatsu, Kiyotaka; Murakami, Sadayoshi*; Yamamoto, Satoshi*; Idomura, Yasuhiro; Sakamoto, Yoshiteru; Tanaka, Kenji*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 85(12), p.839 - 842, 2009/12

no abstracts in English

Journal Articles

Advanced diagnostics for burning plasma experiments

Sasao, Mamiko*; Yamada, Hiroshi*; Baba, Mamoru*; Kondoh, Takashi; Peterson, B. J.*; Kawahata, Kazuo*; Mase, Atsushi*; Yoshikawa, Masayuki*; Azechi, Hiroshi*; Toi, Kazuo*; et al.

Fusion Science and Technology, 51(2T), p.40 - 45, 2007/02

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

Several unexplored physics issues will be studied in burning plasma experiments, planned on ITER in the near future. To carry out these studies, it is essential to develop novel diagnostic systems, such as fusion product measurement systems and high-resolution, high-reliability profile measurement of various plasma parameters. Scientific research on "Advanced Diagnostics for Burning Plasma Experiment" was assigned as a priority area by MEXT in 2004, and more than 20 studies are currently underway under this program. The feasibility of several new diagnostic concepts applicable to ITER is examined and diagnostic components for these systems are now under development.

Oral presentation

Development of high temporal and spatial quality, high intensity laser system

Kiriyama, Hiromitsu; Ochi, Yoshihiro; Mori, Michiaki; Tanaka, Momoko; Okada, Hajime; Kosuge, Atsushi; Yoshida, Fumiko; Shimomura, Takuya; Sasao, Hajime; Nakai, Yoshiki*; et al.

no journal, , 

We describe two specific high intensity laser systems that are being developed in our laboratory for many applications such as high field science and nonlinear optics. We report on an ultra-high intensity petawatt-class Ti:sapphire chirped-pulse amplification laser system that can produce a pulse energy of $$sim$$ 18 J with $$sim$$ 30 fs pulse duration for studying extremely high intensity laser matter interaction process and a small-scaled Yb:YAG chirped-pulse amplification laser system that can generate a pulse energy of $$sim$$ 100 m J of $$sim$$ 500 fs pulse duration for compact, high efficiency, high repetition system. We discuss the basic design aspects and present the results from our experimental investigations of these laser systems.

Oral presentation

Result of demonstration test on decontamination technology, 11; Evaluation result of incineration fly ash washing technique

Umemiya, Noriko; Maruyama, Noboru; Yoshida, Mami; Tagawa, Akihiro; Watanabe, Masahisa

no journal, , 

no abstracts in English

Oral presentation

Analysis of each radionuclides discharged by the Fukushima Daiichi Nuclear Power Station accident measured by airborne surveys

Nishizawa, Yukiyasu; Yoshida, Mami; Sanada, Yukihisa; Torii, Tatsuo

no journal, , 

Many radioactive substances were released by the Fukushima Daiichi Nuclear Power Plant accident occurred on March 11, 2011 in the atmosphere. A lot of short half-life nuclides which are $$^{131}$$I, $$^{132}$$Te, etc., in addition to longer half- lived nuclides such as $$^{134}$$Cs and $$^{137}$$Cs. The estimated release amount of these nuclides from the reactor 1st to 3rd unit is reported, but it's found to be quite different in the short half-lived nuclides by the reactor units. Because the radioactivity ratio of $$^{134}$$Cs and $$^{137}$$Cs was slight different between the reactor units, it can be considered that the valuable source is obtained by the measurement of $$^{134}$$Cs/$$^{137}$$Cs ratio in the environment around the Fukushima Daiichi Nuclear Power Station at the present stage when the nuclides with short half-lives had already decayed. We have measured high-resolution $$gamma$$-ray spectrum using an unmanned helicopter equipped with LaBr$$_{3}$$(Ce) detector in a 3-km range from the power station which was near to the release source of the radioactive cesium. Because the LaBr$$_{3}$$(Ce) detector has high resolution of $$gamma$$ rays, the discrimination of many nuclides is possible. In addition, there is extremely much number of the data provided by the distribution measurement with the unmanned helicopter. Because a new map was illustrated by the analysis of the $$^{134}$$Cs/$$^{137}$$Cs ratio, we report the outline.

Oral presentation

Development of energy recognizable type gamma camera mounted on the unmanned helicopter II, 2; Field test around the Fukushima Daiichi NPP site

Shikaze, Yoshiaki; Torii, Tatsuo; Nishizawa, Yukiyasu; Yoshida, Mami*; Shimazoe, Kenji*; Jiang, J.*; Takahashi, Hiroyuki*; Kurosawa, Shunsuke*; Kamada, Kei*; Yoshikawa, Akira*; et al.

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Contribution of fungal hyphal elongation to radiocesium transfer in deciduous broad-leaved litter

Sasaki, Yoshito; Niizato, Tadafumi; Amamiya, Hiroki*; Yoshida, Kaori

no journal, , 

Radiocesium deposited in the forest released by the accident at the Fukushima Daiichi Nuclear Power Station would remain in the forest and part of it would circulate due to the small amount of outflow from the forest. One possible source of dissolved radiocesium that is easily taken up by organisms is the litter layer. To clarify the contribution of fungal mycelial elongation in the transfer of radiocesium in the litter layer, we investigated the effect of the presence of fungi on the transfer of radiocesium from litter Cs(H) with high radiocesium concentration to litter Cs(L) with low radiocesium concentration. Fungal growth was observed in the test plots where the fungi were present. Regardless of with or without fungi, the Cs-137 concentration of Cs(L) reached about 50 Bq/kg on the 50th day, and then gradually increased to about 100 Bq/kg on the 150th day. This result suggested that the radiocesium was transferred by a physical force other than the hyphal elongation of the fungus in the litter layer.

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