1. Variation of 137 Cs activity concentration in flood and pore water in paddy fields and its transfer to rice.
- Author
-
Tsukada H, Saito T, Hirayama T, Matsuoka H, and Nakao A
- Subjects
- Japan, Floods, Agriculture, Cesium Radioisotopes analysis, Oryza metabolism, Oryza chemistry, Radiation Monitoring, Soil Pollutants, Radioactive analysis, Water Pollutants, Radioactive analysis, Fukushima Nuclear Accident
- Abstract
Caesium-137 (
137 Cs) is a major anthropogenic radionuclide released into the environment as a result of the TEPCO Fukushima Daiichi Nuclear Reactor Station accident (occurring on March 11, 2011). Rice, being a staple food in Asian countries, including Japan, and is predominantly cultivated in paddy fields. Consequently,137 Cs present in rice is absorbed from both soil and irrigation water, making it the most important crop for estimating internal radiation doses. In this study, over the 2018-2022 cultivation periods, flood water and pore water samples were collected biweekly from paddy fields. These samples were analyzed to measure the137 Cs activity concentration, as well as the potassium (K+ ) and ammonium (NH4 + ) concentrations. Under anaerobic conditions, the137 Cs+ activity concentration in pore water increased markedly to reach a value 20-fold higher than that in flood water, correlating with NH4 + concentration. However, despite the release of137 Cs+ caused by increased NH4 + concentrations in pore water due to reduction processes, the137 Cs+ /K+ ratio did not increase, which was attributed to the simultaneous release of K+ . The competition between137 Cs+ and K+ uptake by plants indicates that rice uptake of137 Cs is not necessarily enhanced during the waterlogging period., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
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