抄録
The concentrations of 226Ra in upland field crops (e. g., cabbage, leek, onion, potato. and so on) and associated soils collected from 45 locations throughout Japan were determined in order to obtain soil-to-crop transfer factors (TFs). Concentrations of 226Ra in the soils collected in southwestern Japan were higher than those in northeastern Japan; however, no correlations between 226Ra concentrations in crops and soils were observed. The TFs ranged from <1.1 × 10-3 to 5.8 × 10-2 with a geometric mean of 6.4 × 10-3. These data were within the 95% confidential range of TF-Ra for several crops as reported in the IAEA Technical Reports Series No. 364. Among the alkaline earth metals, TF-Ba was similar to TF-Ra.
