Accumulation of 137Cs in Trefoil (Leaf and Stem), “Mitsuba”, Cryptotaenia japonica Hassk, Immersed in Hydroponic Culture Medium

Accumulation of 137Cs in trefoil (leaf and stem), “Mitsuba”, Cryptotaenia japonica Hassk, with or without root was investigated to prepare higher radioactive plant in hydroponic culture medium (140-150 Bq/ml) . It was found that 137Cs concentration in plant tissue was increased with time, as high as 1.6 times of that in the culture medium after 4 days. On the other hand, 137Cs concentration was affected by carrier element (Cs > 6ppm) and coexistent elements in the medium. Radioactivity of the plant after 4 days was shown to be sufficient for successive experiments.