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Journal Articles

Ten years after the NPP accident at Fukushima; Review on fuel debris behavior in contact with water

Grambow, B.; Nitta, Ayako; Shibata, Atsuhiro; Koma, Yoshikazu; Utsunomiya, Satoshi*; Takami, Ryu*; Fueda, Kazuki*; Onuki, Toshihiko*; Jegou, C.*; Laffolley, H.*; et al.

Journal of Nuclear Science and Technology, 59(1), p.1 - 24, 2022/01

 Times Cited Count:0 Percentile:0.37(Nuclear Science & Technology)

Journal Articles

Selective removal of radiocesium from micaceous clay for post-accident soil decontamination by temperature-controlled Mg-leaching in a column

Yin, X.; Zhang, L.*; Meng, C.*; Inaba, Yusuke*; Wang, X.*; Nitta, Ayako; Koma, Yoshikazu; Takeshita, Kenji*

Journal of Hazardous Materials, 387, p.121677_1 - 121677_10, 2020/04

Oral presentation

Database for analytical data of radioactive wastes originated from the accident in Fukushima Daiichi Nuclear Power Station

Nitta, Ayako; Oki, Keiichi; Koma, Yoshikazu

no journal, , 

Various radioactive wastes generated in Fukushima Daiichi Nuclear Power Station should be safely disposed of. The properties of the wastes are required to understand. For that, the wastes are sampled and performed analyses. To utilize obtained analytical data, the database "FRAnDLi" was made to provide the data through the Internet.

Oral presentation

Oral presentation

Investigation of the radionuclide transfer based on the radiochemical analysis of the genuine samples at Fukushima Daiichi NPS site, 1; Research for actinide transfer to secondly waste from water treatment

Murakami, Erina; Oki, Keiichi; Takahatake, Yoko; Nitta, Ayako; Shibata, Atsuhiro; Koma, Yoshikazu

no journal, , 

no abstracts in English

Oral presentation

Study on the radioactive contamination in the reactor building unit #4 of Fukushima Daiichi NPS

Nitta, Ayako; Hinai, Hiroshi; Shibata, Atsuhiro; Nomura, Kazunori; Oki, Keiichi; Koma, Yoshikazu

no journal, , 

Oral presentation

Investigation of the radionuclide transfer based on the radiochemical analysis of the genuine samples at Fukushima Daiichi NPS site, 7; Actinide nuclides in the contaminated water

Hinai, Hiroshi; Nitta, Ayako; Shibata, Atsuhiro; Koma, Yoshikazu; Kaneko, Masaaki*; Ichikawa, Masashi*

no journal, , 

no abstracts in English

Oral presentation

Radiochemical analysis of actual samples collected at the Fukushima Daiichi NPS site

Ichikawa, Masashi*; Kaneko, Masaaki*; Koma, Yoshikazu; Hinai, Hiroshi; Nitta, Ayako; Shibata, Atsuhiro

no journal, , 

To study on treatment and disposal of solid waste generated at Fukushima Daiichi NPS (1F), radionuclide composition of sample taken from the bottom of primary containment vessel (PCV) of unit 1 was acquired by radioactivity analysis. It was the first time that nuclide composition data of samples taken from the inside of the reactor had been acquired, and the acquisition of these data will make it possible to estimate the origin of contaminants.

Oral presentation

Investigation of the radionuclide transfer based on the radiochemical analysis of the genuine samples at Fukushima Daiichi NPS site, 5; Estimation method of the origin of contamination in the reactor

Kaneko, Masaaki*; Ichikawa, Masashi*; Hinai, Hiroshi; Nitta, Ayako; Shibata, Atsuhiro; Koma, Yoshikazu

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Characterization of radioactive samples at Fukushima Daiichi NPS site, 2; Radiochemical analysis of spent activated carbon adsorbents in Multiple Radio-nuclides Removal System

Nitta, Ayako; Hinai, Hiroshi; Ichige, Yoshiaki; Koma, Yoshikazu; Shibata, Atsuhiro

no journal, , 

no abstracts in English

Oral presentation

Analysis of alpha radionuclide in the contaminated water at the torus room of unit #2 reactor of Fukushima Daiichi NPS, 1; Outline of the state analysis of alpha radionuclides containing in the solid component

Kitatsuji, Yoshihiro; Ouchi, Kazuki; Yomogida, Takumi; Oka, Toshitaka; Nitta, Ayako; Hinai, Hiroshi; Koma, Yoshikazu; Konno, Katsuhiro*

no journal, , 

In order to clarify the chemical species of alpha nuclides in the contaminated water of the Fukushima Daiichi Nuclear Power Station, sludge was classified by particle size. The concentration of alpha radioisotope was measured and the particles were investigated. Most alpha particles were larger than 10 micrometers and settled at the bottom of the torus chamber.

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