Radionuclides accumulation

The dependence of total i Cs activity in a given layer on the amount of biomass present, and on the mode of radionuclide accumulation (via the roots or via the aerial parts of the plants)... 

Radium, thorium, and other radionuclides accumulate in uranium mill tailings. The potential environmental effects of these radionuclides has become of increasing concern to the public. In the future, it may be necessary to modify existing uranium recovery processes to accommodate removal of radium and perhaps other radioactive decay products of uranium. 

Radionuclide accumulation was followed in laboratory systems in which the concentrations of stable elements were kept constant (23). Changes in concentrations were followed in critical tissues as well as the entire body. The loss of radionuclides was followed in animals that had accumulated the radionuclides for 48 d in the laboratory. After exposure to the stable and radioactive nuclides, they were transferred to nonradioactive, unfiltered, circulating seawater(at the Marine Laboratory of California State University, Huinbolt) in which biological loss of the radionuclides was followed. 

On December 4, 1973, the prerelease oysters were removed at 0900 h, and the postrelease were removed at 1230 h animals were placed in the discharge canal water at 1530 h on December 3. Compared with the expected concentrations in the water, the amounts of most radionuclides accumulated per hour during the release were lower in December than in July (Table IV). 

The differences between the quantities accumulated in oysters held in filtered vs. nonfiltered water suggest that particles play an important role in the accumulation" of elements. Particles in the water may be living microorganisms, organic detritus, inorganic material, or any combination of the three and may vary in quantity, both with time and location. The role of particles in radionuclide accumulation differed with each radionuclide. In oysters, Co appears to be accumulated primarily from the suspended particulate fraction, whereas appears to be... 

Harrison, F.L., Wong, K.M., and Heft, R.E. Role of water and particulates in radionuclide accumulation in the oyster Crassostrea gigas, p. 9-20, in Cushing, C.E., Jr., ed., "Radioecology and Energy Resources," Dowden, Hutchinson, and Ross, Stroudsberg, Pennsylvania, 1976. 

Radionuclide Accumulation at a Hydroelectric Power Dam 2.4 Accumulation of plutonium... 

Gadd, G. M., and White, C. (1989). Heavy metal and radionuclide accumulation and toxicity in fungi and yeasts. In Metal-Microbe Interactions, ed. Poole, R. K., and Gadd, G. M., IRL Press, Oxford, 19-38. 

Duursma, E.K. (1984) Problems of sediment sampling and conservation for radionuclide accumulation studies. In Sediments and Pollution in Waterways. IAEA-TecDoc-302, pp. 127-135. Vienna International Atomic Energy Agency. 

The aquarium experiments weie designed to show the rate and extent of the radionuclide accumulations by organisms and sediments of the lake and to furnish guidelines for the field applications. The general objectives of the field experiments were (1), to measure the accumulations of the selected nuclides in organisms with access to their usual sources of nutrition and (2), to evaluate the role of the food web in the accumulation by measuring relative assimilation directly from the water in organisms held in containers. 

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