Radioactive dose rates and fallout radionuclide activities in sediment deposits along rivers draining the main Fukushima plume, Japan

This dataset compiles all the radioactive dose rates measurements and the anthropogenic fallout radionuclides analysed in recent sediment deposits collected in the coastal catchments draining the main radioactive plume of Fukushima, Japan (2011-2020). Gamma-emitting fallout radionuclides activities (Cs-137, Cs-137, Ag-110m) were determined by gamma spectrometry using HPGe detectors (Canberra/Ortec), and activities were decay-corrected to the sampling date. Uncertainties reached ca. 5-10% on Cs-134 and Cs-137 activities, and ca. 15-20% on Ag-110m activities at the 95% confidence level. Radiation dose rates were systematically measured in the field (at 1-cm height from the soil) using a radiameter (LB123 D-H10, Berthold Technologies) in recent sediment drape deposits and in nearby soils along rivers (i.e. in a 10 to 20 m wide area along rivers). This data was collected in the framework of the TOFU (Agence Nationale de la Recherche; grant no. ANR-11-JAPN-001) and the AMORAD (Programme des Investissements d'Avenir; grant no. ANR-11-RSNR-0002) projects. The support of Centre Nationalde la Recherche Scientifique (CNRS, France) and Japan Society for the Promotion of Science (JSPS) is also gratefully acknowledged (grant no. PRC CNRS-JSPS 2019-2020, no. 10; CNRS International Research Project - IRP -MITATE).本数据集汇编了2011-2020年间，在日本福岛主放射性羽流流经的沿海集水区采集的近代沉积层中测得的放射性剂量率数据，以及其中分析得到的人为沉降放射性核素数据。 发射γ射线的沉降放射性核素活度（Cs-137、Cs-137、Ag-110m）采用高纯锗（HPGe）探测器（Canberra/Ortec品牌）通过γ能谱法测定，所有活度均已按采样日期进行衰变校正。 在95%置信水平下，Cs-134与Cs-137活度的测量不确定度约为5%-10%，Ag-110m活度的测量不确定度约为15%-20%。 辐射剂量率采用辐射仪（LB123 D-H10，Berthold Technologies品牌）在野外系统测定，测定高度为距土壤表面1厘米处，采样对象包括沿河的近代沉积覆盖层及周边土壤（即沿河宽度10至20米的区域）。 本数据集的采集工作依托TOFU项目（法国国家科研署，Agence Nationale de la Recherche，资助编号ANR-11-JAPN-001）与AMORAD项目（未来投资计划，Programme des Investissements d'Avenir，资助编号ANR-11-RSNR-0002）开展。同时衷心感谢法国国家科学研究中心（CNRS）与日本学术振兴会（JSPS）的资助支持，相关资助编号为PRC CNRS-JSPS 2019-2020 No.10，以及法国国家科学研究中心国际研究项目——IRP-MITATE。