放射性铈在模拟水生生态系中的行为

研究＾１４１Ｃｅ在水－底泥－水生动植物系统中的迁移和消长动态，结果表明，系统各组分中＾１４１Ｃｅ浓度与时间关系由多项指数描述，其中池水中的＾１４１Ｃｅ浓度随时间延长单调地降低，底泥中＾１４１Ｃｅ浓度随时间延长增加，水生动植物中＾１４１Ｃｅ浓度则各自经历某一最大值后逐渐降低，水生动植物对＾１４１Ｃｅ皆有一定的富集能力，其大小次序依次为：金鱼藻〉螺狮〉鱼，而鱼体中的＾１４１Ｃｅ主要集中内脏，螺壳与螺肉

BEHAVIOR OF RADIOACTIVE CERIUM IN A SIMULATED AQUATIC ECOSYSTEM

The dynamics of transport, accumulation and disapperance of 141 Ce in pond watersilt-aquatics system were studied. The results showed that the relation between the concentra-tion of 141 Ce in each compartment and the time could be described by multi-component expo-nential laws. The concentration of 141 Ce in pond water decreased monotonously with time,but the concentration of 141 Ce in silt would increase with time. The concentration of 141 Cein the aquatics increased to their maxima then decreased slowly. 141 Ce could be concentratedby the aquatics to a certain degree, and the magnitude of their concentration factors was:hornwort>> snail> fish. The uptake of 141 Ce by fish was mainly in the viscera, wheras itsconcentration showed little differences in the shell and flesh of snail.