Temporal trends of 137Cs concentration in seawaters and bottom sediments in coastal waters around Japan: implications for the Kd concept in the dynamic marine environment

Radioactivity concentrations of 137 Cs in seawaters and bottom sediments have been measured in the coastal waters off all nuclear power plant sites in Japan. Sediment distribution coefficient ( K d ) values obtained before the Fukushima Daiichi Nuclear Power Plant accident were variable and related...

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Bibliographic Details
Published inJournal of radioanalytical and nuclear chemistry Vol. 323; no. 1; pp. 567 - 580
Main Authors Kusakabe, Masashi, Takata, Hyoe
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 2020
Subjects
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
Cs
Long-term monitoring
Fukushima
Bottom sediment
Seawater
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Summary:Radioactivity concentrations of 137 Cs in seawaters and bottom sediments have been measured in the coastal waters off all nuclear power plant sites in Japan. Sediment distribution coefficient ( K d ) values obtained before the Fukushima Daiichi Nuclear Power Plant accident were variable and related to the specific surface area of the bottom sediment. A mathematical model suggested that before the accident the K d values were in the transient state approaching a dynamic equilibrium with a converged K d value of 1000–1600. Based on a post-accident mathematical model, the apparent K d reached the maximum of about 10 4 and then decreased until now, converging to 6 × 10 3 on average.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-019-06958-z