Radioactivity Distribution of the Fruit Trees Ascribable to Radioactive Fall Out (VII)—The Changes of the Radiocaesium Concentration of Peach Branch Two Years After Fukushima Daiichi Nuclear Power Plant Accident—

Abstract

At experimental field in Nishi-Tokyo City, we investigated the seasonal changes in radiocaesium concentration divided into bark and wood in peach lateral shoot during 16months from four months after the accident at Fukushima Daiichi Nuclear Power Plant. With the passage of season, the concentration of radiocaesium in bark tended to more decrease than natural attenuation. We compared concentration of radiocaesium with ⁴⁰K, and considered that the dilution effect due to falling of the outer bark which had high concentration of radiocaesium was involved with that decrease.