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Journal Articles

Depth profile and inventory of $$^{36}$$Cl in soil near the Fukushima Dai-ichi Nuclear Power Plant

Ota, Yuki*; Sueki, Keisuke*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Matsunaka, Tetsuya*; Matsumura, Masumi*; Tosaki, Yuki*; Honda, Maki*; Hosoya, Seiji*; Takano, Kenta*; et al.

JAEA-Conf 2018-002, p.99 - 102, 2019/02

no abstracts in English

Journal Articles

Removal of soluble strontium via incorporation into biogenic carbonate minerals by halophilic bacterium Bacillus sp. strain TK2d in a highly saline solution

Horiike, Takumi*; Dotsuta, Yuma*; Nakano, Yuriko*; Ochiai, Asumi*; Utsunomiya, Satoshi*; Onuki, Toshihiko; Yamashita, Mitsuo*

Applied and Environmental Microbiology, 83(20), p.e00855-17_1 - e00855-17_11, 2017/10

 Times Cited Count:14 Percentile:59.31(Biotechnology & Applied Microbiology)

Radioactive strontium ($$^{90}$$Sr) leaked into the ocean from the Fukushima Daiichi Nuclear Power Plant after the nuclear accident. Since the removal of Sr using general adsorbents is not efficient at high salinity, this study investigated removal of soluble Sr from a saline solution by biogenic carbonate minerals. An isolate, Bacillus sp. strain TK2d, from marine sediment removed more than 99 % of Sr in a saline solution. Sr adsorbed at the cell surface and then carbonate minerals containing Sr developed outside the cells.

Journal Articles

Radioactive Cs in the estuary sediments near Fukushima Daiichi Nuclear Power Plant

Yamasaki, Shinya*; Imoto, Jumpei*; Furuki, Genki*; Ochiai, Asumi*; Onuki, Toshihiko; Sueki, Keisuke*; Namba, Kenji*; Ewing, R. C.*; Utsunomiya, Satoshi*

Science of the Total Environment, 551-552, p.155 - 162, 2016/05

 Times Cited Count:31 Percentile:70.53(Environmental Sciences)

Cesium-137 ($$^{137}$$Cs) of estuary sediment impacted by the FDNPP was measured. Increasing radioactivity was observed from surface to bottom. 90% of the $$^{137}$$Cs was strongly bound to clay minerals in the estuary sediments. These results suggest that $$^{137}$$Cs is being transported from contaminated paddy fields to the estuary.

Journal Articles

Radioactive Cs in the severely contaminated soils near the Fukushima Daiichi Nuclear Power Plant

Kaneko, Makoto*; Iwata, Hajime; Shiotsu, Hiroyuki; Masaki, Shota*; Kawamoto, Yuji*; Yamasaki, Shinya*; Nakamatsu, Yuki*; Imoto, Jumpei*; Furuki, Genki*; Ochiai, Asumi*; et al.

Frontiers in Energy Research (Internet), 3, p.37_1 - 37_10, 2015/09

The mobility of the aggregates of submicron-sized sheet aluminosilicate in the surface environment is a key factor controlling the current Cs migration in Fukushima.

JAEA Reports

None

Ochiai, Kenichi; Murayama, Yasumi; Fujita, Hideto; *; *

PNC TN8410 97-118, 68 Pages, 1997/05

PNC-TN8410-97-118.pdf:24.03MB

None

JAEA Reports

None

Ochiai, Kenichi; Murayama, Yasumi; Fujita, Hideto; *; *

PNC TN8410 97-117, 93 Pages, 1997/05

PNC-TN8410-97-117.pdf:38.47MB

None

JAEA Reports

None

Ochiai, Kenichi; Murayama, Yasumi; Fujita, Hideto; Takeda, Keiji; *; *

PNC TN8410 97-116, 105 Pages, 1997/05

PNC-TN8410-97-116.pdf:31.65MB

None

JAEA Reports

None

Ochiai, Kenichi; Murayama, Yasumi; Fujita, Hideto; Takeda, Keiji; *; *

PNC TN8410 97-115, 106 Pages, 1997/05

PNC-TN8410-97-115.pdf:40.37MB

None

Oral presentation

Development of signal processing and circuit technology for high-accuracy radiation and neutron measurements, 2; Development of high-counting-rate $$^{3}$$He position sensitive proportional counter system

Birumachi, Atsushi; Katagiri, Masaki*; Ebine, Masumi; Nakamura, Tatsuya; Arai, Yoichi*; Ochiai, Kunihito*

no journal, , 

no abstracts in English

Oral presentation

Quantitative analysis of $$^{36}$$Cl in surface soils near the Fukushima Dai-ichi Nuclear Power Plant using accelerator mass spectrometry

Ota, Yuki*; Sueki, Keisuke*; Sasa, Kimikazu*; Takahashi, Tsutomu*; Matsunaka, Tetsuya*; Matsumura, Masumi*; Tosaki, Yuki*; Hosoya, Seiji*; Takano, Kenta*; Ochiai, Yuta*; et al.

no journal, , 

no abstracts in English

Oral presentation

Remediation mechanisms of uranium mill-tailing site at Ningyo-toge, Japan, under the circumneutral condition

Kawamoto, Keisuke*; Ochiai, Asumi*; Takeda, Ayaka*; Nakano, Yuriko*; Yokoo, Hiroki*; Onuki, Toshihiko*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Utsunomiya, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Elucidation of the formation mechanism of manganese oxide by manganese oxidizing fungi at Ningyo-toge Mine

Takeda, Ayaka*; Nakano, Yuriko*; Ochiai, Asumi*; Yokoo, Hiroki*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Nagayasu, Takaaki; Onuki, Toshihiko*; Utsunomiya, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

Remediation mechanisms of uranium mill-tailing site at Ningyo-toge, Japan, under the circumneutral condition

Kawamoto, Keisuke*; Ochiai, Asumi*; Takeda, Ayaka*; Nakano, Yuriko*; Yokoo, Hiroki*; Oki, Takumi*; Onuki, Toshihiko*; Ohara, Yoshiyuki; Fukuyama, Kenjin; Utsunomiya, Satoshi*

no journal, , 

In the Ningyo-toge uranium mine, Okayama, Japan, various toxic elements such as U, As, and Ra are present in the mine wastewaters, of which the concentration except for Ra in the wastewater decrease below the regulatory limit by transport to the slag dumping pond. The mechanisms of decreasing their concentrations in the wastewaters are not fully understood. In order to understand the fundamental processes of natural attenuation at this site, we have investigated the wastewaters and solids from upstream to the pond at the downstream. Wastewater was contacted with oxygenated water and the amount of dissolved oxygen increased. Simultaneously dissolved ferrous iron was oxidized to form ferrihydrite nanoparticles, which are associated with silica colloids, As and U. The ferrihydrite nanoparticles as suspended colloids were transported to the pond in downstream, where the waste stream is completely oxidized. In the slag dumping pond, Mn dioxide, birnessite, dominantly occurs forming a mixture with ferrihydrite + silica colloid, which has a potential to adsorb Ra$$^{2+}$$. Consequently, Fe hydroxides nanoparticles and Mn dioxides in Ningyo-toge play a key role on removing U, As and Ra from the wastewater.

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