A Model for Evaluating the Radioactive Contamination in the Urban Environment

도시환경에서 방사성물질의 오염평가 모델개발

  • Published : 2005.09.30


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).


  1. G. N. Kelly, 'The Importance of the Urban Environment for Accident Consequences', Radiation Protection Dosimetry Vol. 21 No. 1/3, 13-20(1985)
  2. IAEA, 'Validation of Environmental Model Predictions (VAMP) : A Programme for Testing and Improving Biospheric Models Using Data from the Chernobyl Fallout', STI/PUB/932 (1993)
  3. M. J. Crick and J. Brown, 'EXPURT : A Model for Evaluating Exposure from Radioactive Material Deposited in the Urban Environment', NRPB report, NRPB-R235 (1990)
  4. S-R. Peterson et al., 'CHERURB-95 : Urban Contamination and Dose Model', A research report prepared for the Atomic Energy Control Board(1995)
  5. E. R. Rochedo, L. F. Conti and H. G. Paretzke, 'PARATI - A Dynamic Model for Radiological Assessments in Urban Areas ; Part I. Modelling of Urban Areas, Their Contamination and Radiation Fields', Radiat. Environ. Biophys., 35, 243-261(1996) https://doi.org/10.1007/s004110050037
  6. John E. Till and H. Robert Meyer, 'Radiological Assessment - A Textbook on Environmental Dose Analysis', U. S. NRC, NUREG/CR-3332, ORNL-5968(1983)
  7. IAEA, 'Modelling the deposition of airborne radionuclides into the urban environment : First report of the VAMP Urban Working Group', IAEA-TECDOC-760(1994)