@article{oai:repo.qst.go.jp:00049177,
 author = {Tagami, Keiko and Tsukada, Hirofumi and Uchida, Shigeo and Howard, Brenda and Tagami, Keiko and Tsukada, Hirofumi and Uchida, Shigeo},
 journal = {Environmental Science and Technology},
 month = {Sep},
 note = {Radiocesium (RCs) mobility in soil is initially relatively high when the nuclide first comes into contact with soil, after which the mobile fraction decreases with time due to RCs fixation to soil particles, commonly called an aging effect. Consequently, the RCs activity concentration in plants grown in soil were expected to decrease with time after the Fukushima Daiichi nuclear power plant accident in 2011. In this study, we collated data on concentration ratios (CR) of RCs between brown rice grain and paddy soil and compared CR values reported before and after the accident. For this purpose, soil and rice data collected after the accident from paddy fields which did not have additional potassium fertilizer added (for remediation purposes) were selected. The geometric mean rice/soil CR of RCs for all types of soil was 1.2×10^-2 in 2011 (n=62) and the value declined to 3.5×10^-3 in 2013 (n=32) which was similar to that for 1995-2007 of 3.4×10^-3 (n=120). The comparison suggests that the mean soil-to-rice grain concentration ratio had returned to that prevailing before the accident after less than three years. It was also confirmed that CR values for rice sampled from paddy fields were lower than those obtained from pot experiments.},
 title = {Changes in the soil to brown rice concentration ratio of radiocaesium before and after the Fukushima Daiichi Nuclear Power Plant Accident in 2011},
 volume = {52},
 year = {2018}
}