Radioecology of 60Co in Urazoko Bay : Correlation between Levels of 60Co in Sargassoes and Marine Sediments

概要

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In order to know factors which influence ^>60>Co contamination of sargassoes in Urazoko Bay, where a nuclear power plant is located, correlations between the contaminations of the algae and of the marine environment were examined, based on field data observed since January 1971. It was found that ;[1] correlation between the ^<60>Co concentration in sargassoes (Y_<algae>PCi/kg raw weight) and distance from discharge outlet of tbe nuclear power plant to the sampling points (d km) was expressed by a function, Y_<algag>=C・exp(-kd), where C and k are constants, and k increased successively from 0.388 in Nov. 1971 to 1.200 in Nov. 1974, whereas C decreased from 120 to 27 during the same period. [2] ^<60>Co content in the sargassoes seemed to be contributed dominantly by the dislodged ^<60>Co from heavily contaminated sediment rather than freshly discharged ^<60>Co from the power plant. The amount of dislodged ^<60>Co was estimated from both the ^<60>Co distribution in marine sediment in Urazoko Bay and results of a tracer experiment concerning the dislodgement of ^<60>Co from marine sediment.
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