Kierepko R, Sahoo S K, Hosoda M, Tokonami S, Sorimachi A, Kim E, Ohno M
Fukushima Project Headquarters, National Institute for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan; Department of Nuclear Physical Chemistry, Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Radzikowskiego 152, Poland.
Fukushima Project Headquarters, National Institute for Quantum and Radiological Sciences and Technology, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan.
J Environ Radioact. 2019 Jan;196:133-140. doi: 10.1016/j.jenvrad.2018.11.006. Epub 2018 Nov 16.
The Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident has caused significant radionuclide contamination. Pu isotopes at the level of GBq were released from the damaged reactors to terrestrial and marine ecosystems. In this work, 35 samples were collected at different locations of Fukushima. Samples consisted of three types, soil, forest litter and alluvial dust (road dust, sludges from drainage systems and below gutter pipe outflows). The obtained activity ratios of Pu/Pu ranged from 0.030 to 1.86. 14 of our samples contained trace amounts of Pu originating from the damaged reactors (2SM verification). Our study identified a few previously unknown "hot spots" of Pu/Pu activity ratio localized in an area between 15 and 30 km in the northwest direction from the FDNPP. Additionally, results obtained in this study combined with previously published data allowed us to prepare a map of spatial distribution of the Pu isotope fingerprints (Pu/Pu) in Fukushima Prefecture.
福岛第一核电站事故造成了严重的放射性核素污染。受损反应堆向陆地和海洋生态系统释放了吉贝克勒尔水平的钚同位素。在这项工作中，在福岛的不同地点采集了35个样本。样本包括三种类型：土壤、森林凋落物和冲积尘（道路灰尘、排水系统污泥和排水沟管流出物下方的污泥）。获得的钚/钚活度比范围为0.030至1.86。我们的14个样本含有微量源自受损反应堆的钚（2SM验证）。我们的研究确定了一些先前未知的钚/钚活度比“热点”，位于福岛第一核电站西北方向15至30公里之间的区域。此外，本研究获得的结果与先前发表的数据相结合，使我们能够绘制出福岛县钚同位素指纹（钚/钚）的空间分布图。
