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BOOKLET to Provide Basic Information Regarding Health Effects of Radiation (5th edition)
Chapter 7 Environmental Radiation Monitoring 7.7 Radiation Monitoring of Public Water Areas

Radioactive Material Monitoring in the Water Environment (River Sediments)

Radioactive Material Monitoring in the Water Environment (River Sediments)_Figure

Radioactive cesium concentrations in river sediments were measured in FY2022 as in the previous year.

A total of 2,010 samples, including 814 samples collected in Fukushima Prefecture and others collected in Iwate, Miyagi, Ibaraki, Tochigi, Gunma, Chiba and Saitama Prefectures and the Tokyo Metropolis, were surveyed.

The survey results showed that concentrations of radioactive cesium detected in approx. 99% of these samples were less than 1,000 Bq/kg (dry).

  • Included in this reference material on March 31, 2013
  • Updated on March 31, 2024
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