Radioactivity Distribution of the Fruit Trees Ascribable to Radioactive Fall Out:A Study on Stone Fruits Cultivated in Low Level Radioactivity Region

Abstract

After the accident of Fukushima Daiichi Nuclear Power Plant, radioactivity of fruit trees grown at an experimental farm of Nishi-Tokyo City in Tokyo, which was located about 230km away from the power plant, was measured. Each organ of Japanese apricot and peach trees was taken at harvesting stage, respectively, and the radioactivity of ¹³⁴Cs and ¹³⁷Cs was measured. Although radioactivity of orchard soil and tree each organ were low generally, that of bark sampled from 3-old-year branch was as high as 1570Bq/kg −dry weight. The total radioactivity of ¹³⁴Cs and ¹³⁷Cs in edible portion was far lower than that of the regulation level.