目的为了解天然放射性核素２２６Ｒａ、２２８Ｒａ、２１０Ｐｂ与２１０Ｐｏ在水生物及食物链中转移和蓄积情况。方法定点采集养殖水产品及栖息环境中水与底质沉积物，按不同的实验需要，每个鲜样分别剥取肉，骨（壳），鳞片和胃肠。烹饪样品，洗净、称重、清炖，熟后分离出骨（壳），余为食物。样品分别测定２２６Ｒａ、２２８Ｒａ、２１０Ｐｂ和２１０Ｐｏ含量。数据按统计学要求处理，配对数据，作了配对显著性检验。结果２２６Ｒａ、２２８Ｒａ和２１０Ｐｂ主要沉积于骨（壳）中，浓集系数为１０２～１０３，肉中为１００～１０２。２１０Ｐｏ主要蓄积在水生物胃肠中，浓集系数在１０２～１０４，鱼类胃肠与贝类肉中可达１０４。水产食品烹饪加工过程２２６Ｒａ、２２８Ｒａ和２１０Ｐｂ在食物链中转移不明显，经配对显著性检验，差异无显著性（Ｐ＞０．０５）；然而２１０Ｐｏ在淡水鱼类和虾类中转移是明显的，肉配对检验有非常显著性差别（Ｐ＜０．０１）。结论水生物对２２６Ｒａ、２２８Ｒａ、２１０Ｐｂ和２１０Ｐｏ有很强浓集能力。虽然骨（壳）中２２６Ｒａ、２２８Ｒａ与２１０Ｐｂ含量较高，但在烹饪过程不会明显的向食物中转移；然而２１０Ｐｏ则不然，会有不同程度地转移，这将给食物中? Objective To understand the transfer and accumulation of natural radionuclides 226Ra, 228Ra, 210Pb and 210Po in aquatic organisms and the food chain. Methods Water and sediment of aquaculture products and habitats were collected by fixed-point method. Meat, bone (shell), scales and gastrointestinal were respectively stripped for each fresh sample according to different experimental needs. Cooking samples, washed, weighed, stewed, cooked bone (shell), the rest of the food. Samples were assayed for 226Ra, 228Ra, 210Pb and 210Po content. Data processing according to statistics, matching data, made a paired significance test. Results 226Ra, 228Ra and 210Pb were mainly deposited in the bones (shell) with a concentration coefficient of 102-103 and a meat content of 100- 102.210Po. The main accumulation was in the aquatic organ, with a concentration coefficient of 102-104. Fish Gastrointestinal and shellfish up to 104 in the meat. However, there was no significant difference (P> 0.05) between the two cultivars 226Ra, 228Ra and 210Pb in the food chain. However, the transfer of 210Po in freshwater fish and shrimp was notable, There was a significant difference in meat pairing test (P <0.01). Conclusion Aquatic organisms have strong ability to concentrate 226Ra, 228Ra, 210Pb and 210Po. Although the content of 226Ra, 228Ra and 210Pb in the bones is high, it will not be obviously transferred to the food during the cooking process; however, the 210Po will transfer to different degrees, which will give the food?