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Pratama, M. A.; 高原 省五; 宗像 雅広; 本間 俊充; 米田 稔*
no journal, ,
This study proposes a new method to estimate the ingestion intake based on the time-dependent cesium (Cs) concentration in separate sewer sludge by using mass balance analysis of Cs in wastewater treatment plant and reverse biokinetic model. The results showed that the new method successfully estimated ingestion intake of Cs. However, several uncertainties resulted from parameters used in the models are indeed presence. In addition, this method needs to be tested in other areas to ensure its reliability and to identify its limitation.
Pratama, M. A.; 高原 省五; 宗像 雅広; 米田 稔*
no journal, ,
The time-dependent behavior analysis, parameterization, and the identification of factors affecting parameter values of radiocesium in sludges of 10 sewer systems in Fukushima Prefecture were attempted. It was obtained that the time-dependent cesium concentration follows two exponentials model consisting of the fast and slow transfer coefficient of cesium from ground surfaces to sewer systems and their statistical coefficients. Whereas values for the transfer coefficients are relatively the same between the sewer systems, the values of statistical coefficients significantly vary depending on the specific characteristic of each sewer's service area. Further analysis shows that decontamination activity and land use on each sewer's service area play important roles in determining the value of statistical coefficients.