A Study on the Correlation between the Volume of Indoor Space and the Measured Concentration of Indoor Radon

실내 체적과 라돈 농도와의 상관관계 연구

  • Kang, Sung-A (Center for Advanced Radiation Technology, Chonbuk National University) ;
  • Han, Dong-Hyun (Center for Advanced Radiation Technology, Chonbuk National University) ;
  • Kim, Chong-Yeal (Center for Advanced Radiation Technology, Chonbuk National University)
  • 강성아 (전북대학교 공학연구원 첨단 방사선 응용연구센터) ;
  • 한동현 (전북대학교 공학연구원 첨단 방사선 응용연구센터) ;
  • 김종일 (전북대학교 공학연구원 첨단 방사선 응용연구센터)
  • Published : 2007.09.30

Abstract

The corelation between the indoor volume and the measured radon concentration has been analyzed by comparing the radon concentration and the indoor volume of apartment rooms in Jeonju City. We also measured the annual exposure dose based on the variation in indoor radon concentration over time. To do this, we took 8 larger rooms and 8 smaller rooms of apartment, respectively, as a sample. The average volume of the larger rooms and that of the smaller rooms were $31.59\;m^3$ and $16.82\;m^3$, respectively. The average radon concentration of the larger rooms and that of the smaller rooms turned out to be $71.73\;Bq/m^3$ and $108.51\;Eq/m^3$, respectively. indicating that indoor volume is in inverse proportion to the radon concentration, i.e., the bigger the ratio of the surface area/volume, the higher the indoor radon concentration. From the measurement of the variation in indoor radon concentration over time fur a single day, the average intraday radon concentration variation was found to be about $46.8\;Bq/m^3$. The highest level of concentration ($114.5\;Bq/m^3$) was measured between 8 and 10 AM and the lowest level of concentration ($67.7\;Bq/m^3$) between 2 and 4 PM. The annual exposure dose turned out to be in the range of 0.3 mSv/yr to 2.16 mSv/yr, showing that the dose in some apartments exceeded 1.3 mSv/yr, the numerical value presented by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR).

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