AI Article Synopsis
- Researchers measured sediment cesium-137 concentrations near the Fukushima Daiichi Nuclear Power Plant from 2011 to 2017, noting high levels initially but a decrease in seven stations over time.
- They identified 25 radioactive cesium-bearing microparticles (CsMPs), with their contribution to sediment samples varying significantly, particularly lower in the southern part of the plant compared to the northern part.
- The study suggests that while many small CsMPs in the south dispersed shortly after the accident, larger, more persistent CsMPs likely accumulated in the northern region due to the sediment's characteristics.
Article Abstract
Sedimentary cesium-137 concentrations around the Fukushima Daiichi Nuclear Power Plant (FDNPP) were measured from 2011 to 2017 at eight stations. Although high values were observed until 2013, decreasing trends were observed at the surface sediments of seven stations. We isolated 25 radioactive Cs-bearing microparticles (CsMPs; 1.0-5385 Bq per particle). The contribution ratio of CsMPs to each sample ranged from 4.1% to 99.5% (median 58.8%), with the contribution ratio of the CsMPs in the southern part of the FDNPP was low compared to that from the northern part. In the southern part of the FDNPP, small CsMPs that could not be isolated in this study were present in large quantities immediately after the accident, and gradually diffused away and/or were dissolved over time. In contrast, the CsMPs in the northern part of the FDNPP have most likely accumulated over time, as suggested by the silty nature of the sediments there.
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| http://dx.doi.org/10.1016/j.marpolbul.2020.111769 | DOI Listing |
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