Abstract: The uptake and distribution of stable ¹³³Cs and ⁸⁸Sr in sunflower (Helianthus annuus L.) were studied by pot experiments. The results showed that the content of ¹³³Cs or ⁸⁸Sr in leaf increased with the increasing soil concentration of each element. The ⁸⁸Sr content in sunflower leaf was generally one order of magnitude higher than that of ¹³³Cs in each same treatment level. The ¹³³Cs and ⁸⁸Sr were unevenly distributed in the different organs. The ¹³³Cs concentration was higher in roots than in other plant organs (stems, leaves, flowers). Contrary to the distribution of ¹³³Cs in plant, ⁸⁸Sr, except for roots, were mainly translocated to leaves. The distribution of cesium and strontium are agreed with the results of present research on radioactive ¹³⁷Cs and ⁹⁰Sr, ¹³³Cs and ⁸⁸Sr could be useful to understand and predict the long-term movements of ¹³⁷Cs and ⁹⁰Sr, respectively. Sunflower is the acceptable plants for phytoremediation to the low-level radioactive soil.

Key words: ¹³³Cs, ⁸⁸Sr, Helianthus annuus L., uptake, distribution, phytoremediation