Analysis of Time Series of the Ambient Dose Rates

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  • AOYAMA Tomoo
    Information and Education Institute in Edogawa University, 474 Komaki, Nagareyama, Chiba 270-0198, Japan
  • ASANUMA Jun
    Center for Research in Isotopes and Environmental Dynamics at University of Tsukuba, 1-1-1 Tennodai Tsukuba, Ibaraki 305-8572, Japan

Abstract

<p>Radioactive substances are diffused by meteorological effects and soil property or underground water. The movements affect the ambient dose rate slowly and with smoothing in the long term. We detect the phenomena at monitoring posts in Fukushima. The monitoring post measures the flux from radionuclides; therefore, we discuss relations between the flux and mass density. Time-decreasing of the flux is a function of convection-diffusion of carriers of the nuclides. At the same time, it is also a decay function of radionuclides. We discuss product of the two functions, and get an expression for the time series of radioactive contaminated grounds. By using the expressions, we research changes of typical contaminants in Fukushima. This indicates movements of radionuclides.</p>

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