Abstract
Radioecological behavior of /sup 60/Co after a single administration was investigated in a non-flowing small-scale rice field ecosystem, which consisted of natural pond water, rice seedlings, mud snails, loaches, earthworms and sandy soils. The radioactivity of /sup 60/Co in water decreased rapidly for about ten days and gradually thereafter. Ten days after addition of /sup 60/Co, the fraction, remained in aqueous phase, was about 0.1% of the initialiy administered radioactivity. The radioactive concentrations of both mud snails and earthworms reached maximums in two hours, while those of rice seedlings, loaches, and sandy soils reached maximums in one day, and then decreased with time to an equilibrium level. The relative order for maximum concentration factors was: rice seedling > mud snail) sandy soil > earthworm 7 loach. In a mass balance analysis of the radionuclide in the system, /sup 60/Co retained in the biomass including side wall algae grown during the experiment showed about 12%, although the proportion based on wet weight of the biomass was only about 2.3%. (auth)
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