Welcome to Environmental Radioactivity Datasets website at CRiES, Univ. of Tsukuba
| Title | Research of Radioactive Cesium Distribution and its Temporal Changes in the Marine Sediment in the Coastal Area of Niigata Prefecture, Mainly around the Agano River Estuary Offshore 2011-2022 | |
|---|---|---|
| Author 1 | Takahiro Suzuki |
|
| Author 2 | Tomohiro Tsuchida | |
| Author 3 | Tetsuya Watanabe | |
| Author 4 | ||
| Authors 5- | ||
| Subject | Oceans | |
| Subject_sub1 | ||
| Subject_sub2 | ||
| Abstract | This dataset contains 755 records of radioactive cesium concentrations (Cs-134 and Cs-137) measured in seabed sediments off the coast of Niigata Prefecture, Japan. The data were collected as part of an ongoing monitoring program to assess the environmental impacts of the Fukushima Daiichi Nuclear Power Plant accident (March 2011) and subsequent sediment inflows from heavy rainfall in July 2011. Sampling was conducted at three transects located offshore of the Agano River mouth, Niigata East Port, and Sekiya Bunsui, at depths of 20, 40, 60, 80, and 100 meters. Samples were collected using a Smith-McIntyre grab sampler, and gamma-ray spectrometry was performed with a high-purity Ge semiconductor detector (Canberra, 43% relative efficiency). Detection limits for Cs-134 and Cs-137 were 1.0–1.5 Bq/kg (wet weight). The dataset provides concentration values corrected for decay at the time of sampling and normalized to dry mass, facilitating comparative analysis of radiocesium migration in coastal marine sediments. | |
| Temporal coverage | 2011~2022 | |
| Spatial coverage | 37.19~38.38 in Nlat, 138.09~139.43 in Elon | |
| File format | Delimited | |
| Language | English | |
| Discovery metadata record | ||
| Publisher | Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba | |
| Publication year | 2025 | |
| Publication date | 27th of February | |
| Digital Object Identifier (DOI) | 10.34355/Niigata.Pref.IERM.00260 Data Download (27KB) | |
| Short DOI | ||
| Citation text | Suzuki, T., Tsuchida, T., & Watanabe, T. (2025). Research of radioactive cesium distribution and its temporal changes in the marine sediment in the coastal area of Niigata Prefecture, mainly around the Agano River Estuary offshore 2011-2022 [Dataset]. Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba. https://doi.org/10.34355/Niigata.Pref.IERM.00260 | |
| Serial at center | 00260 | |
| Serial at each Univ./Institute | NIIG0001 | |
| Key word 1 | radioactive cesium | |
| Key word 2 | marine sediment | |
| Key word 3 | the Coastal Area of Niigata Prefecture | |
| Key word 4 | ||
| Key word 5 | ||
| Remarks | The activity values or minimum detectable activities (MDA) of Cs-134 and Cs-137 are reported with two significant figures, with rounding applied at the third significant figure. | |