2013 Volume 62 Issue 1 Pages 25-29
To clarify the mechanism of radiocaesium contamination of rice, we performed an imaging analysis to find the radiocaesium distribution pattern throughout the rice plant. The result demonstrated that the rice plant which was grown on the particular paddy field, where a highly contaminated brown rice was produced in 2011, contained larger amount of radiocaesium in the newer leaves than in the older leaves. In contrast, rice plant grown in an another area, where the contamination level in grain was low, contained larger amount of radiocaesium in the older leaves. It was suggested that the uptake of radiocaesium was promoted and/or radiocaesium in plant was redistributed to the newer organs during summer season when the rice was heading.