Distribution of Radionuclides among Green Alga, Marine Sediments and Sea Water

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Distributions of radionuclides among green alga (Ulva pertusa), marine sediment and sea water were examined in laboratory experiments with radioisotope tracers to look into the behavior of the radionuclides released into the coastal sea. Marine sands from the five different seashores along the coast of Japan wereused. Distributions of ^<60>Co, ^<95>Zr- ^<95>Nb and ^<106>Ru- ^<106>Rh in these sands were by far the highest of the three components (marine sand, sea water and marine alga). The distributions of the three radionuclides had not so large fluctuations among the five marine sands and were considered to be rather constant. The total amount found in marine sand and green alga was about 90% for the three radionuclides but about 20% for ^<137>Cs on the average in two weeks after the start of the experiments. The activity ratio of marine sediment (radioactivity in 1 g of sediment/radioactivity in 1 ml of sea water) was 4000 for ^<60>Co, 30 for ^<137>Cs, 1800 for ^<95>Zr- ^<95>Nb and 900 for ^<l06>Ru- ^<106>Rh. The artificial radionuclides released into an open sea were immediately diluted, diffused and flowed out off shore, while, radionuclides released into a semi-closed bay might stay in the bay for a relatively long period. In the period, the radionuclides may distribute themselves to marine organism and sediment in the bay with the larger scale than in an open sea. Consequently, distributions of some radionuclides among marine organism, sediment and sea water in a bay were investigated. For the investigation, it is necessary to examine some factors, for instance, closing grade and depth of the bay, exchange rate of water in it, ability of its sediment for the accumulation of radionuclides and biomass of marine organism.
日本放射線影響学会の論文

Distribution of Radionuclides among Green Alga, Marine Sediments and Sea Water

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