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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：3 Percentile：43.07(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 
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.
U and 
Ra for insects and amphibians living in the vicinity of the closed uranium mine at Ningyo-toge, JapanSakoda, Akihiro; Murakami, Shoichi*; Ishimori, Yuu; Horai, Sawako*
Journal of Radiation Research (Internet), 61(2), p.207 - 213, 2020/03
Times Cited Count：1 Percentile：10.72(Biology)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 
-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.
