Infiuences of Marine Sediment on the Accumulation of Radionuclides by Green Alga (ulva pertusa)

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Distributions of radionuclides (^<60>Co, ^<137>Cs, ^<95>Zr-^<95>Nb and ^<106>Ru-^<106>Rh) among green alga (Ulva pertusa), sea water and marine sediment were examined by radioisotope tracer experiment in order to estimate the influence of sediment on the accumulation of radionuclides by the alga. By the application of the compartment model to the experimental results. exponential formulas of distributions were obtained. Through comparison of the transfer coefficients of radionuclides calculated from the exponential formulas, the influence of the sediment on the accumulation of the radionuclides by the green alga was determined to be the largest for ^<60>Co, followed by ^<95>Zr-^<95>Nb ^<106>Ru-^<106>Rh and ^<137>Cs in this order The actrvity ratros of ^<95>Zr-^<95>Nb and ^<l06>Ru-^<106>Rh calculated from the transfer coefficients are larger for the alga than for the sediment, inversely those of ^<60>Co and ^<137>Cs show higher values for the sediment than for the alga. Especially, in the case of ^<60>Co, the activity ratio for the sediment is approximately 20 times greater than that for the alga. Biological half lives in green alga estimated from the transfer coefiicients were 10 days for ^<60>Co, 7 days for ^<137>Cs, 26 days for ^<95>Zr-^<95>Nb and 24 days for ^<106>Ru-^<106>Rh.
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