| Supported by National Natural Science Foundation (Numerical Simulation and Controlling research on Radioactive Contamination Ejection from Uranic Ventilation), surveying on the spot and model experiment investigation on the diffusion status of radionuclide are accomplished in this dissertation, which provides guidance for numerical simulation and controlling research on radioactive contamination.Diffusion of contamination, especially the diffusion of radionuclide in atmosphere, is an important issue in contamination-controlling and environment-administering.Due to the radioactive risk of radionuclide itself, it brings extreme complexity to the problem. The survey on the spot is unable to repeat its status because of randomicity, and it has too much consumption on manpower and money. It is hard to control model precision and boundary condition, so the accuracy of numerical simulation is affected. Nevertheless, physical experiment simulation based on indoor model provides us a powerful means to investigate diffusion of radionuclide in atmosphere.Due to its unrestricted for weather, easily recurring and conveniently setting certain condition, shortening the period of experiment, saving manpower and money, so physical experiment simulation is a reliable and practicable way to valuate diffusion status of contamination.The main work and the originality points of this dissertation could be concluded as the following parts:(1) To analyze systematically the component of contamination ejection from uranic ventilation and its harming, various factors on the diffusion of radionuclide in atmosphere are studied, which offers some theoretical basis for research on this problem.(2) To utilize water tank to accomplish successfully physical experiment simulation on the diffusion of radionuclide ejection from uranic ventilation. The diffusion of salt liquor in water is similar to radiomuclide in air, so it can be used to simulate the diffusion... |
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