Behavior of ^<60>Co in A Non-flowing Small-scale Rice Field Ecosystem

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Radioecological behavior of ^<60>Co after a single administration was investigated in a nonflowing small-scale rice field ecosystem which consisted of natural pond water, rice seedlings, mud snails, loaches, earthworms and sandy soils. The radioactivity of ^<60>Co in water decreased rapidly for about ten days and gradually thereafter. Ten days after addition of ^<60>Co, the fraction, remained in aqueous phase, was about 0.100 of the initially 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 > loach. In a mass balance analysis of the radionuclide in the system, ^<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%.
日本放射線影響学会の論文