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本文应用同位素示踪和γ能谱分析方法,就近岸沉积物对放射性同位素~(90)Sr((~85)Sr),~(137)Cs,~60Co及~(106)Ru的吸附性能进行了研究。对同种类型的沉积物,吸附分配系数Kd值的变化顺序大致为~(137)Cs>~(60)Co>~(106)Ru>~(90)Sr;对同种放射性同位素,吸附分配系数Kd值与沉积物的粒度系数(Mdφ)存在正相关关系;在低活度示踪条件下,Kd值不变。实验结果与相应海区的实际调查结果相符,沿岸核企业在设计排污方案时,亦应考虑沉积物对放射性同位素的吸附及其污染影响。
In this paper, the adsorption properties of radioactive isotopes of ~ (90) Sr (~ 85) Sr, ~ (137) Cs, ~ 60Co and ~ (106) Ru on nearshore sediments were studied by isotope tracing and γ- Were studied. For the same type of sediments, the order of variation of Kd values is ~ (137) Cs> ~ (60) Co> ~ (106) Ru> ~ (90) Sr. For the same radioisotope, There is a positive correlation between the Kd value and the grain size coefficient (Mdφ) of sediment. Under the condition of low activity, the Kd value does not change. The experimental results are in line with the actual findings of the corresponding sea areas. When designing the sewage disposal plan for coastal nuclear enterprises, the adsorption of radioactive isotopes by sediments and the pollution impacts should also be considered.