福岡県における^<90>Sr及び^<137>Csの濃度分布と推移(1989-2000)

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This paper summarizes the distribution and concentration of ^<90>Sr and ^<137>Cs fallout in the natural environment (deposition, soil, total diet, service water, seawater and sea sediment) of Fukuoka Prefecture, and related transition during the period from 1989 to 2000. The ^<90>Sr and ^<137>Cs concentrations respectively showed a gradual decrease over the timeframe ; especially, ^<90>Sr deposition has not heen detected since 1997, while ^<137>Cs has been detected rarely. Both radionuclides had accumulated in the soil at comparatively high concentrations for a long period of time ; the average concentrations of ^<90>Sr and ^<137>Cs in the upper 5-cm soil layer were 5.3 Bq/kg dry and 6.0 Bq/kg dry, respectively. Their concentrations in the total diet were significantly different between the urban districts and fishing villages, mainly depending on the contents of the meals. No significant difference was observed in ^<90>Sr concentration when comparing fresh water and seawater. ^<137>Cs was detected in seawater, but not in fresh water. On the other hand, ^<137>Cs was detected in sea sediment, but ^<90>Sr was not. These observations suggest that there is a remarkable difference in the behavior of each nuclide in the environment.
日本保健物理学会の論文