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Saeki, Morihisa; Iwanade, Akio; Ito, Chikara; Wakaida, Ikuo; Thornton, B.*; Sakka, Tetsuo*; Oba, Hironori
Journal of Nuclear Science and Technology, 51(7-8), p.930 - 938, 2014/07
Times Cited Count：70 Percentile：98.67(Nuclear Science & Technology)To inspect post-accident nuclear core reactor of the TEPCO Fukushima Daiichi Nuclear Power Plant, a transportable fiber-coupled LIBS instrument was developed. The developed LIBS instrument was designed to analyze the underwater sample in high-radiation field by single-pulse breakdown with gas flow or double-pulse breakdown. To check the feasibility of the assembled fiber-coupled LIBS instrument to the inspection inside Fukushima Daiichi Nuclear Power Plant, we investigated (1) influence of radiation dose on optical transmittance of the laser delivery fiber, (2) survey of the LIBS techniques to analyze the underwater sample and (3) candidates of emission lines for analysis of the debris. By employing the selected emission lines, we demonstrated that the developed LIBS instrument can analyze the simulated debris underwater by the single-pulse breakdown with the gas flow with high signal to noise ratio.
Kasai, Noboru; Iwanade, Akio; Ueki, Yuji; Saiki, Seiichi; Hoshina, Hiroyuki; Seko, Noriaki
JAEA-Technology 2013-046, 25 Pages, 2014/02
JAEA-Technology-2013-046.pdf:9.63MB
To remove their radioactive species which have long radioactive half-life from the circumstances as rapidly as possible, we developed novel radioactive cesium adsorbents containing ammonium 12-molybdophosphate, which had adsorption selectivity for cesium ion, by radiation grafting method. The bench-scale equipment 150 times as large volume as laboratory scale was established for graft polymerization. The radioactive cesium adsorbents 1,000 times as large as laboratory scale were successfully synthesized with the bench-scale equipment. Moreover, the adsorption performance with radioactive cesium in environmental water was evaluated at field tests in Fukushima Prefecture. As a result, the adsorbents could successfully remove radioactive cesium dissolved in environmental water below the detection limit of radioactivity concentration.
Iwanade, Akio; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji; Saiki, Seiichi; Seko, Noriaki
Journal of Radioanalytical and Nuclear Chemistry, 293(2), p.703 - 709, 2012/08
Times Cited Count：35 Percentile：92.09(Chemistry, Analytical)We have developed a material that can be used to remove cesium (Cs) in Fukushima Prefecture and other contaminated areas. The developed material was prepared by radiation-induced graft polymerization of ammonium 12-molybdophosphate (AMP) and acrylonitrile (AN) onto nonwoven polyethylene fabric. In the batch study, the adsorbent was able to remove 90%, 87% and 64% of Cs from pure water, acidic water and seawater, respectively. In the column study, adsorbent packed in a column with a diameter of 7 mm and a height of 5 cm was able to remove nearly the entire amount of dissolved Cs. The solution (1 ppm Cs at pH 7) was pumped into the column at a space velocity of 300 h
, in which the Cs adsorption capacity at the breakthrough point reached 54 g-Cs/kg-adsorbent. Adsorbent packed into a cartridge with a diameter of 4 cm and a height of 3.8 cm was used in a field test on removing dissolved radioactive Cs in Iitate-mura, and this test was conducted successfully.
Iwanade, Akio*; Umeno, Daisuke*; Saito, Kyoichi*; Katakai, Akio; Tamada, Masao
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Sato, Yuichi*; Hiroki, Akihiro; Ota, Akio*; Nagasawa, Naotsugu; Seito, Hajime; Iwanade, Akio; Yamabayashi, Hisamichi*; Yamamoto, Takayoshi*; Tamada, Masao; Kojima, Takuji
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Seko, Noriaki; Ueki, Yuji; Hoshina, Hiroyuki; Saiki, Seiichi; Iwanade, Akio; Kasai, Noboru
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Seko, Noriaki; Kasai, Noboru; Ueki, Yuji; Saiki, Seiichi; Hoshina, Hiroyuki; Iwanade, Akio; Suzuki, Shinichi; Yaita, Tsuyoshi; Matsuhashi, Shimpei; Ito, Hisayoshi; et al.
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Saiki, Seiichi; Ueki, Yuji; Hoshina, Hiroyuki; Iwanade, Akio; Kasai, Noboru; Seko, Noriaki
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Hamasuna, Takeyasu*; Maruo, Kazuhiko*; Iwanade, Akio; Fukuta, Yutaka; Nogami, Daichi; Watanabe, Koichi
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Seki, Tomomi*; Tajima, Tetsuro*; Seki, Norifumi*; Iwaki, Keiko*; Kaburagi, Kuniaki*; Fukushima, Katsumi*; Nagai, Hiroyoshi*; Fukushima, Yasunori*; Iwanade, Akio; Fukuta, Yutaka; et al.
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Iwanade, Akio; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji; Saiki, Seiichi; Shibata, Takuya; Seko, Noriaki
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Saiki, Seiichi; Iwanade, Akio; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji; Shibata, Takuya; Seko, Noriaki
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nanoparticlesSaeki, Morihisa; Taguchi, Tomitsugu; Iwanade, Akio*; Oba, Hironori
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nanoparticlesSaeki, Morihisa; Taguchi, Tomitsugu; Iwanade, Akio*; Oba, Hironori
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Hoshina, Hiroyuki; Kasai, Noboru; Ueki, Yuji; Saiki, Seiichi; Shibata, Takuya; Iwanade, Akio; Seko, Noriaki
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Saeki, Morihisa; Iwanade, Akio; Ito, Chikara; Wakaida, Ikuo; Thornton, B.*; Sakka, Tetsuo*; Oba, Hironori
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To perform elemental analysis of solid samples under water and radiation field, we designed and constructed the instrument for fiber-coupled laser induced breakdown spectroscopy (LIBS). The LIBS analysis of the underwater sample is difficult, because the water quickly quenches the plasma plume that is generated by the ablation. To solve this problem, we prepared quasi-atmospheric condition around the plasma plume by using gas flow or double pulse irradiation system, and succeeded to observe similar spectrum between atmospheric and underwater condition. Moreover, the optical property of the fiber was investigated by exposing 
Co 
-ray with total dose over 1 MGy to the optic fiber. As a result, we found that radiation exposure to the fiber leads to slight damage in near infrared one. Thus, we designed the fiber-coupled LIBS system to perform laser ablation by near-infrared laser beam (1064 nm) and to efficiently detect plasma emission in near infrared region.
Shibata, Takuya; Seko, Noriaki; Iwanade, Akio; Suzui, Nobuo; Fujimaki, Shu; Kasai, Noboru; Saiki, Seiichi; Hoshina, Hiroyuki; Ueki, Yuji
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Hoshina, Hiroyuki; Kasai, Noboru; Ueki, Yuji; Saiki, Seiichi; Shibata, Takuya; Iwanade, Akio; Seko, Noriaki
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Saeki, Morihisa; Iwanade, Akio; Ito, Chikara; Wakaida, Ikuo; Thornton, B.*; Sakka, Tetsuo*; Oba, Hironori
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Oba, Hironori; Saeki, Morihisa; Miyabe, Masabumi; Akaoka, Katsuaki; Wakaida, Ikuo; Iwanade, Akio; Ito, Chikara; Tanabe, Rie*; Ito, Yoshiro*; Sakka, Tetsuo*; et al.
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no abstracts in English
