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| Title | 2018 Monitoring of Artificial Radionuclides in Seawater and Seabed soil around Japan | |
|---|---|---|
| Author 1 | Japan Coast Guard | |
| Author 2 | ||
| Author 3 | ||
| Author 4 | ||
| Authors 5- | ||
| Subject | Oceans | |
| Subject_sub1 | ||
| Subject_sub2 | ||
| Abstract | This dataset comprises 46 data records and is derived from radioactivity surveys by Japan Coast Guard, former Maritime Safety Agency, in 2018. The radioactivity surveys aim to monitor artificial radionuclides in seawater and seabed soil around Japan, because the artificial radionuclides were released into the environment through past nuclear tests and accidents at nuclear facilities. The study of seawater commenced in 1959, while the study of seabed soil began in 1974, with both continuing to the present day. | |
| Temporal coverage | 2018 | |
| Spatial coverage | 20.4166666666667 N ~ 39.005 N, 123.733333333333 E ~ 143.666666666667 E | |
| 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 | 10th of May | |
| Digital Object Identifier (DOI) | 10.34355/JCG.HOD.00291 Data Download (9KB) | |
| Short DOI | ||
| Citation text | Japan Coast Guard. (2025). 2018 Monitoring of Artificial Radionuclides in Seawater and Seabed soil around Japan [Dataset]. Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba. https://doi.org/10.34355/JCG.HOD.00291 | |
| Serial at center | 00291 | |
| Serial at each Univ./Institute | JCGHOD0007 | |
| Key word 1 | Sr-90 | |
| Key word 2 | Cs-137 | |
| Key word 3 | Cs-134 | |
| Key word 4 | Co-60 | |
| Remarks | Samples collection for this survey was conducted by Japan Coast Guard. The samples comprise 37 seawater and 9 seabed soil specimens. Of 37 samples in seawater, 9 were in coastal water, 28 were in the offing, including 4 of the intermediate water in depth of 642-746 m; and all samples in seabed were collected from the sampling sites in coastal water. The analytes were as follows: Co-60, Sr-90, Ru-106, Cs-134, and Cs-137 in seawater; Co-60, Sr-90, Cs-134, and Cs-137 in seabed soil. The concentrations of radioactivity are shown two significant figures with the estimated error coefficient in the dataset. When measured value was smaller than threshold or a detection limit which is defined as a value of three times the coefficient of error, it was noted as 'Not Detected'. Due to 'Not Detected' at all sampling sites, Co-60 and Ru-106 in seawater, as well as Co-60 in seabed soil, were omitted from the dataset. | |