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首页> 美国政府科技报告 >Experiments on Radionuclide Accumulation by Fishes from the Angra Dos Reis Region of Brazil. Final Report for the Period May 1 - September 15, 1988.
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Experiments on Radionuclide Accumulation by Fishes from the Angra Dos Reis Region of Brazil. Final Report for the Period May 1 - September 15, 1988.

机译：巴西安格拉杜斯雷斯地区鱼类放射性核素积累试验。 1988年5月1日至9月15日期间的最终报告。

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摘要

To follow the bioaccumulation and tissue distribution of (137)Cs and (60)Co in fish from tropical waters near the Angra nuclear power station in Brazil, juvenile grouper (Epinephelus sp.) were exposed under laboratory conditions to Angra sea water containing the two radionuclides initially added in chloride form. During the 4-month exposure period, the sea water was not changed and the fish received regular rations of non-radioactive food. Following uptake, the fish were dissected and composite tissue samples monitored for radioactivity. (137)Cs concentration factors (CFs) were 3 and 5 in whole fish and muscle, respectively. The highest concentration of (137)Cs was found in the muscle which accounted for 66% of the total body burden. In contrast, the highest concentration and greatest fraction (19%) of (60)Co was located in the liver. Whole body and muscle CFs for (60)Co, 0.2 and 0.08 respectively, were much lower than those for (137)Cs. Compared with published data, only very small amounts of both radionuclides were taken up by bone in the present study. This observation and the fact that much higher (137)Cs CFs have been reported in fish from field studies suggests that uptake through the food chain is the principal pathway for bioaccumulation in nature. Elution of freshly-prepared and previously-used radioactive sea water through chelating resins indicated that (60)Co added in the cationic form was almost totally converted to neutral or anionic forms after four months. Additional experiments carried out with the previously-used experimental media demonstrated that the possibly ligand-bound (60)Co was approximately 2.5 times more available for uptake by grouper than the cationic forms initially present. It is concluded that the uptake of (60)Co by fish exposed to radioactive effluents would be a function of the different forms of (60)Co present. (Atomindex citation 20:048572)

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