Distribution and Behavior of ^<239>Pu, ^<137>Cs and ^<60>Co in the Sediment at Urazoko Bay

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The concentrations of ^<239>Pu and ^<137>Cs due to fall-out, and ^<60>Co originating from the nuclear power reactor in the sediments sampled at Urazoko Bay, Fukui Pref. , Japan, were determined and their correlation with the particle size or the amount of glycerol adsorbed on the sediments as a measure of surface area of the sediment particles were examined. By the size segregatlon of sedrment, the contents of ^<239>Pu, ^<137>Cs and ^<60>Co were found to reach to the highest value in the fraction below 37 μm in diameter. The concentrations of these radionuclides for each size fraction were directly proportional to the amount of glycerol adsorbed on the sediment particles. Based on these facts, the normalization of the concentration of these artificial radionuclides by the amount of adsorbed glycerol was attempted. For the fraction below 0.5mm in diameter of various sediments collected at around Urazoko Bay during 1975-1977. It was confirmed that the contents of ^<239>Pu and ^<137>Cs per unit amount of adsorbed glycerol were nearly constant, respectively. Furthermore, the pollution characteristics of ^<60>Co in the sediments, such as the distribution and the accumulation, was clearly estirpated by using such normalization. Around Wakasa Bay, Fukui Pref. , Japan, nine commercial nuclear power reactors are operating at the coastal area, and releasing waste effluent into the marine environment. Although the sediments from Urazoko Bay situated at the western part of Tsuruga Bay showed some contaminations with ^<60>Co and ^<54>Mn caused by the accumulation of low level waste discharged during the past decade from the Tsuruga Nuclear Power Reactor (BWR : 331MW), any remarkable contamination due to nuclear reactor has not been detected in the other coastal areas.
日本放射線影響学会の論文

Distribution and Behavior of ^<239>Pu, ^<137>Cs and ^<60>Co in the Sediment at Urazoko Bay

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