Measurement and estimation of radiocesium discharge rate from paddy field during land preparation and mid-summer drainage. (May 2016)

• Record Type: Journal Article
• Authors: Miyazu, Susumu; Yasutaka, Tetsuo; Yoshikawa, Natsuki; Tamaki, Shouhei; Nakajima, Kousei; Sato, Iku; Nonaka, Masanori; Harada, Naoki
• Is Part Of: Journal of environmental radioactivity. Volume 155/156(2016:May)
• Page Start: 23
• Page End: 30
• Publication Date: 2016-05
• Subjects: Radiocesium -- Outflow load -- Paddy field -- Drainage water -- Land preparation -- Mid-summer drainage; Radioactivity -- Periodicals; Radiation, Background -- Periodicals; Radioecology -- Periodicals; Radioactive pollution -- Periodicals; Environmental Pollutants -- Periodicals; Radioactive Pollutants -- Periodicals; Radioactivity -- Periodicals; Radioécologie -- Périodiques; Pollution radioactive -- Périodiques; Fond de rayonnement -- Périodiques; 539.752
• DOI: 10.1016/j.jenvrad.2016.01.013
• Languages: English
• ISSNs: 0265-931X

Abstract

Abstract: In this research, we evaluated the range of 137 Cs discharge rates from paddy fields during land preparation and mid-summer drainage. First, we investigated 137 Cs discharge loads during land preparation and mid-summer drainage and their ratio to the 137 Cs inventory of paddy field soil. We found that total discharge rates were 0.003–0.028% during land preparation and 0.001–0.011% during mid-summer drainage. Next, we validated the range of obtained total discharge of 137 Cs from the paddy fields using a simplified equation and literature review. As a result, we conclude that the range of total outflow loads of suspended solids for the investigated paddy field was generally representative of paddy fields in Japan. Moreover, the 137 Cs discharge ratio had a wide range, but was extremely small relative to 137 Cs present in paddy field soil before irrigation. Highlights: 137 Cs discharge loads during land preparation and mid-summer drainage were investigated. An estimation equation for paddy field 137 Cs discharge rate is developed. 137 Cs outflow during land preparation represents 0.003–0.028% of soil inventories. 137 Cs outflow during mid-summer drainage represents 0.001–0.011% of soil inventories.