1967 年 2 巻 4 号 p. 173-178
The characteristic distribution of radioactive fallout 90Sr and 137Cs absorbed into a Satsuma orange fruit was investigated. After peeling, the so-called edible part of the fruit was divided into two parts by use of an autojuicer. One was juice including interior cells of vesicle and a part of vesicle, the other was residue including the vesicle, vascular bundle and carpet wall. The ratio of 90Sr concentration in juice to that in risidue part was found to be three vs. seven, while this ratio was seven vs. three for 137Cs concentration. When expressed in Sr unit, the values (266-422pCi/g Ca) of the residue part were about six times as much as the juice part and about two to three times as much as the rind part. When expressed in Cs unit, the values (88-133pCi/g K) of the rind part was about five times as much as the residue part or the juice part, and the residue and the juice part had almost the same value. For practical purpose, it is more convenient to express 90Sr or 137Cs concentration in orange fruit by content of the nuclide in juice per unit weight of fresh fruit than by the nuclide content per unit weight of so-called edible part of fresh sample.