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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.
Hasan, Md. M.*; Janik, M.*; Sakoda, Akihiro; Iimoto, Takeshi*
Environmental Monitoring and Assessment, 193(12), p.770_1 - 770_10, 2021/12
Times Cited Count：2 Percentile：13.39(Environmental Sciences)Potentially higher cancer risk due to exposure from natural background radiation was indicated for Bangladeshi population by estimations based on the countrywide study. Several regions with elevated natural background exhibited higher soil radium and thorium contents than the world average. Being the decay products of these radioactive elements, natural radon isotopes could constitute environmental risk factors for internal radiation exposure to the lungs of people living in these areas. Although lung cancer is one of most prevalent types of cancer in Bangladesh, its status and features are still unclear. To clarify the present status of one of the potential risk factors for lung cancer in the country, this review intends to ascertain the countrywide radon exposure, and its pathways by types of local dwelling and by regions; which would provide an indication of the internal exposures in areas of elevated natural background radiation and radionuclides of soil as well as an understanding of the preliminary contribution of environmental radon on the country's lung cancer prevalence. In this review, countrywide air radon exposures for Bangladeshi dwellings and workplaces are organized from peer-reviewed published papers. Radon has been identified as one of influential sources of radiation dose in Bangladesh with its higher radon exhalation and emanation rate from soil. A novel nationwide depiction of the overall indoor and soil radon levels for Bangladesh has been made through radiation maps. This would be helpful for designing future systematic radon/radiological surveys and research on the country's lung cancer prevalence.
Ozaki, Hirokazu*; Yoshimura, Kazuya; Asaoka, Yoshihiro*; Hayashi, Seiji*
Environmental Monitoring and Assessment, 193(6), p.369_1 - 369_9, 2021/06
Times Cited Count：6 Percentile：41.49(Environmental Sciences)Otosaka, Shigeyoshi; Kobayashi, Takuya
Environmental Monitoring and Assessment, 185(7), p.5419 - 5433, 2013/07
Times Cited Count：71 Percentile：86.92(Environmental Sciences)From a time-series observation at 9 stations off the coast of Ibaraki, the following transport processes of sedimentary radiocesium can be inferred. (1) Major distributional pattern of the 1FNPP-derived radiocesium in coastal sediments was configurated within half a year after the accident. (2) Larger inventories of sedimentary radiocesium in the shallow region attribute to the higher contact probability of dissolved radiocesium with sediment. (3) Most of radiocesium in the coastal sediments is incorporated into lithogenic fractions, and the incorporation is almost irreversible. (4) Radiocesium is selectively accumulated in the finer-grained sediments. (5) In the study area, as of January 2012, riverine input of suspended particulate matter can be regarded as a minor process to accumulate radiocesium in the coastal sediments. Nevertheless, the relative contribution would increase years later.
