1. Spatiotemporal distributions of Fukushima-derived radionuclides in surface sediments in the waters off Miyagi, Fukushima, and Ibaraki Prefectures, Japan.
- Author
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Kusakabe, M., Oikawa, S., Takata, H., and Misonoo, J.
- Subjects
SPATIOTEMPORAL processes ,FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011 ,RADIOISOTOPES ,SEDIMENTS ,WATER purification - Abstract
Spatiotemporal distributions of anthropogenic radionuclides in surface sediments off Miyagi, Fukushima, and Ibaraki Prefectures were analyzed on the basis of data collected during the monitoring program launched by the Japanese Ministry of Education, Sports, Science and Technology in 2011 right after the Fukushima Nuclear Power Plant accident. Concentrations of
137 Cs in the surface sediments varied spatially by two orders of magnitude from 1.7 to 580 Bq kg-dry-1 , and there was no obvious correlation between137 Cs concentration and the proximity of the sampling location to the site of the accident. The total inventory of137 Cs accumulated in the upper 3 cm of surface sediment in the monitoring area was estimated to be 3.78x1013 Bq, that is 0.1-2% of the total137 Cs flux from the plant to the ocean as a result of the accident (the percentage depends on the model used to estimate the total flux). The spatial variations of137 Cs concentration and inventory depended on two main factors: the137 Cs concentration in the overlying water during the first several months after the accident and the physical characteristics of the sediment (water content and bulk density). The tem-poral variations of the concentrations of other anthropogenic radionuclides (90 Sr,95 Nb,110 mAg,125 Sb,129 Te, and129 mTe) in the sediments were also investigated. The temporal variations of the activity ratios of these nuclides to137 Cs suggest that before the Fukushima-derived nuclides became homogeneous in seawater, they were removed from the water to the sediment. [ABSTRACT FROM AUTHOR]- Published
- 2013
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