Radioactive Material Monitoring in the Water Environment (Lake and Reservoir Sediments)
Radioactive cesium concentrations in lake and reservoir sediments were measured in FY2021 as in the previous year.
A total of 836 samples, including 524 samples collected in Fukushima Prefecture and others collected in Miyagi, Ibaraki, Tochigi, Gunma and Chiba Prefectures, were surveyed.
The survey results showed that concentrations of radioactive cesium detected in approx. 73% of these samples were less than 1,000 Bq/kg (dry).
- Included in this reference material on March 31, 2013
- Updated on March 31, 2023