测量了137Cs、90Sr和Ru在核电厂附近水体沉积物（淤泥和沙）中的分配系数,测量分析了沉积物粒径对3种核素分配系数以及pH值的变化对Ru的分配系数的影响。结果表明：137Cs、90Sr和Ru在淤泥中的分配系数分别为5 000、12、1 000 L/kg,在沙中的分配系数分别为780、6、50 L/kg;当pH值7~8范围内、固液比1∶10 g/mL时,3种核素在淤泥和沙中的分配系数随着颗粒粒径的减小而增大;Ru在淤泥和沙中的分配系数随pH值的升高而增大。%In this paper the solid-to-liquid distribution coefficients for 137Cs,90Sr and Ru in bottom sediment（soil and sand） in the surface water near the nuclear power plant have been measured.The effect of the change of pH on the distribution coefficient values of Ru and the effect of the granularity of sediment on the distribution coefficient values of the three radionuclides have been analyzed.The results indicate that the distribution coefficient values of 137Cs,90Sr and Ru in soil is 780,6,50 L/kg,respectively,the distribution coefficient values in sand is 5 000,12,1 000 L/kg,respectively.As the pH value of 7 to 8 and the solid-to-liquid ratio of 1∶10 g/mL,the distribution coefficient values of the three nuclides in soil and sand increase as the granularity decrease.The distribution coefficient values of Ru in the soil and sand increases as the pH increases.
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