Differences in Fallout-Derived 137Cs and Naturally-Derived 133Cs Transfer to Fruit in Persimmon Tree

Abstract

To confirm the contamination by radiocaesium, the concentrations of 137 Cs and 133 Cs of Japanese persim mon fruits and soils were measured in several orchards. Over 3 years, the 137 Cs concentration tended to decrease in many orchards, and there was no significant difference in the transfer factor. Additionally, 5 to 7 years after the accident, the effect of above-ground contamination seemed to be decreasing, and radiocaesium contamination by roots was likely negligible. The 133 Cs concentration in the soil was similar in all orchards; however, the 133 Cs concentration of fruits in one orchard was higher than that in the other orchards.