Multitracer study on the soil-to-plant transfer of radionuclides in komatsuna at different growth stages

The transfer factor of radionuclides of Na, Mn, Co, Zn, Se, Rb, Sr, Y, Zr, Tc, Rh and Cs in komatsuna (Brassica rapa L. var. perviridis Bail) at diffe rent stages of plant development was determined simultaneously by the multi tracer technique. Komatsuna was grown on soil administered with the multitr acer for 14, 20, 26, and 33 days. The transfer factors were determined not only for edible leaves but also for roots. It was found that the transfer f actors of Rb, Tc, and Cs for the leaves decreased with increasing culture p eriod, while those of Na, Co, Zn, Se, and Sr for leaves remained almost con stant during the culture period. The transfer factor of Mn increased slight ly with time. Extraction of the multitracer from the soil was carried out i n order to study the correlation between the transfer factor and the aging effect of tracers in soil.