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KMID : 0364920050300030099
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Journal of Radiation Protection and Research
2005 Volume.30 No. 3 p.99 ~ p.105
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A Model for Evaluating the Radioactive Contamination in the Urban Environment
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Hwang Won-Tae
Kim Eun-Han
Suh Kyung-Suk
Jeong Hyo-Joon
Han Moon-Hee
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Abstract
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A model for evaluating radioactive contamination in the urban environment, named METRO-K, was developed as a basic step for accident consequence analysis in case of an accidental release. The three kind of radionuclides ({137}Cs,{106}Ru,{131}I) and the different chemical forms of iodine (particulate, organic and elemental forms) are considered in the model. The radioactive concentrations are evaluated for the five types of surface (roof, paved road, wall, lawn/soil, tree) as a function of time. Using the model, the contaminative impacts of the surfaces were intensively investigated with respect to with and without precipitation during the measurement periods of radionuclides in air. In addition, a practical application study was conducted using {137}Cs concentration in air and precipitation measured in an European country at the Chernobyl accident. As a result precipitation was an influential factor in surface contamination. The degree of contamination was strongly dependent on the types of radionuclide and surface. Precipitation was more influential in contamination of {137}Cs than that of {131}I (elemental form).
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KEYWORD
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Urban environment, METRO-K, radioactive concentration, precipitation
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