Measurement of Radon Diffusion Coefficients for Japanese Surface Soils

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  • GUNJI Yasuyoshi
    Environmental and Safety Management Department, Nuclear Fuel Industries, LTD.
  • OKUDA Takeshi
    Environmental and Safety Management Department, Nuclear Fuel Industries, LTD.
  • IIDA Takao
    Department of Nuclear Engineering, Graduate School of Engineering, Nagoya University
  • SASAKI Tomozou
    EBS Technology Research Project, Radioactive Waste Management Funding and Research Center, Pacific Square Tsukishima
  • IMAMURA Mitsutaka
    EBS Technology Research Project, Radioactive Waste Management Funding and Research Center, Pacific Square Tsukishima

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  • 日本の表層土を用いたラドン拡散係数の測定
  • ニホン ノ ヒョウソウド オ モチイタ ラドン カクサン ケイスウ ノ ソクテイ

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Abstract

  The radon diffusion coefficient for soil, D, is a very important parameter used to estimate radon dose for uranium-bearing waste. Many Ds were measured in the uranium mill tailing remediation action project in the US, and a formula for the estimation of diffusion coefficient, Rogers's formula, was proposed. However, it is uncertain whether Rogers's formula is applicable to Japanese soils because most of them have come from volcanic ash and contain much water. This paper describes the development of a measurement apparatus for D using a lump response transient method and a step response transient method, and presents measured D values for Japanese surface soils. Measured alpha ray count curves are good in agreement with those of theory. This shows that radon transportation in soil can be described using Fick's law. Furthermore, the measured effective D values are good in agreement with those of Rogers's formula. This means that Rogers's formula can be applied to Japanese soils.<br>

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