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Journal Articles

Environmental monitoring of trace elements and evaluation of environmental impacts to organisms near a former uranium mining site in Nigyo-toge, Japan

Horai, Sawako*; Murakami, Shoichi*; Sakoda, Akihiro; Nakashita, Rumiko*; Kunisue, Tatsuya*; Ishimori, Yuu

Environmental Monitoring and Assessment, 194(6), p.415_1 - 415_25, 2022/06

 Times Cited Count:2 Percentile:32.35(Environmental Sciences)

This study conducted an investigation of trace element behavior at a former uranium (U) mining site and evaluated environmental impacts to biota. Concentrations of trace elements were determined in sediments, water, and three organism types (insects, frogs, and newts) from three zones in the former U mining site. Concentrations of As and U in the sediments and water samples were the highest at the mill tailings pond site, where post-U extraction remnants have been accumulated. Additionally, among the organisms analyzed the highest levels of these elements/isotopes were found in newts from MP. Considering data analyses of the whole-body element concentrations, bioaccumulation factors, and $$delta$$$$^{15}$$N values for the organisms, it was concluded that newts might be the most vulnerable species in this location. Further monitoring and more accurate evaluation of the ecological impacts are preferred for this former U mining site.

Journal Articles

Concentration ratios of $$^{238}$$U and $$^{226}$$Ra for insects and amphibians living in the vicinity of the closed uranium mine at Ningyo-toge, Japan

Sakoda, Akihiro; Murakami, Shoichi*; Ishimori, Yuu; Horai, Sawako*

Journal of Radiation Research (Internet), 61(2), p.207 - 213, 2020/03

 Times Cited Count:1 Percentile:11.03(Biology)

JAEA Reports

Effects of Misasa hot spring water on the growth of vegetables, 2 (Joint research)

Yamada, Satoshi*; Kita, Makoto*; Ishimori, Yuu

JAEA-Research 2013-016, 32 Pages, 2013/09

JAEA-Research-2013-016.pdf:3.01MB

Tottori University and Japan Atomic Energy Agency started a joint study to investigate the effect of hot spring water on the growth of vegetable plants in 2009. The aim of the study is to examine a feasibility of producing a regionally special vegetable with considering the characteristics of the Misasa district, where radon hot springs are historically famous. This report illustrates the intermediate results obtained from the study carried out from 2011 to 2012. [1] Plant physiological examination: Plant physiological examination revealed the effects of Misasa hot spring water on the growth and mineral contents of vegetable plants. [2] Middle scale test: Four tasks for the practical application study were specified; (1) Best mineral contents in hot spring water, (2) Treatment of pH of hot spring water, (3) Toxic substances in hot spring water, (4) A protocol and a system structure for water culture. Then, a middle scale system for water culture was developed.

JAEA Reports

Technical development to remove radionuclides from agricultural soils by plants (Joint research)

Yamada, Satoshi*; Sakoda, Akihiro; Ishimori, Yuu

JAEA-Research 2012-015, 32 Pages, 2012/07

JAEA-Research-2012-015.pdf:9.25MB

Tottori University and Japan Atomic Energy Agency started a joint study to develop an environmental remediation technique for agricultural soil. Nine plants were water-cultured and examined for screening. A few were selected as candidates for demonstrations in fields. Preselected plants were mainly halophytes. Easily cultivated and harvested plants without harmful effect on new agriculture were also considered. Seedings prepared were first grown for a certain term. Additive-free, $$^{133}$$Cs and $$^{88}$$Sr groups, which are both stable isotopes, were then made. Stems, leaves and roots were harvested, in principle, two weeks after the addition, to measure K, Ca, Mg, Sr and Cs concentrations in them. It was concluded that New Zealand spinach and ice plant were most adequate for removing contaminants from surface soil. The two accumulate Cs and Sr mostly in the shoots, are prostrate, and spread the roots shallowly. For valid application, growth-phase dependences of absorption and distribution, growth property and root distribution should be elucidated. Finally, the application study plan was developed based on screening test results.

Oral presentation

Phytoremediation of radioactive contaminated soil; Screening for plant species with high absorption capacity of Cs and Sr

Goto, Yukari*; Nakagawa, Takuya*; Makino, Yuko*; Yamada, Satoshi*; Yamada, Mina*; Sakoda, Akihiro; Ishimori, Yuu

no journal, , 

Tottori University and Japan Atomic Energy Agency started a joint study to develop an environmental remediation technique for agricultural soil. Nine plants were water-cultured and examined for screening. A few were selected as candidates for demonstrations in fields. Preselected plants were mainly halophytes. Easily cultivated and harvested plants without harmful effect on new agriculture were also considered. Seedings prepared were first grown for a certain term. Additive-free, $$^{133}$$Cs and $$^{88}$$Sr groups, which are both stable isotopes, were then made. Stems, leaves and roots were harvested, in principle, two weeks after the addition, to measure K, Ca, Mg, Sr and Cs concentrations in them. It was concluded that New Zealand spinach and ice plant were most adequate for removing contaminants from surface soil. The two accumulate Cs and Sr mostly in the shoots, are prostrate, and spread the roots shallowly. For valid application, growth-phase dependences of absorption and distribution, growth property and root distribution should be elucidated. Finally, the application study plan was developed based on screening test results.

Oral presentation

Numerical study on combustion processes of radioactive waste in an incinerator

Yanase, Shinichiro*; Sugitsue, Noritake; Ishimori, Yuu; Yokoyama, Kaoru; Ohara, Yoshiyuki; Takahashi, Nobuo; Rong, D.*; Takeda, Hiroshi*; Kochi, Toshinori*; Takami, Toshihiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Transfer of radionuclides and stable elements to insects and amphibians in a uranium mill tailings pond in Japan

Sakoda, Akihiro; Ishimori, Yuu; Murakami, Shoichi*; Horai, Sawako*

no journal, , 

One of major uranium mines in Japan was located in Ningyo-toge, Okayama. Uranium mining and test milling were made here in the past, and then there has been a uranium mill tailings pond in Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency. Since spring 2016, we have performed sampling of non-human biota - insects and amphibians (i.e. frog and newt) - as well as water and sediment in the mill tailings and other two locations (for comparison) to better understand the transfer of elements in such ecosystem. Concentrations of radionuclides and stable elements in the samples were measured mostly by ICP-MS and $$gamma$$-ray spectrometry using a high-purity germanium detector. All samples of sediment, water and organism were found to include more U-238 in the mill tailings pond than those in other two locations. Detailed data will be shown and discussed in terms of the transfer in the environment at the presentation.

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