Measurements of Thoron Concentration by Passive Cup Method and Its Application to Dose Assessment

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著者

    • GUO Qiuju
    • Department of Nuclear Engineering, School of Engineering, Nagoya University
    • IIDA Takao
    • Department of Nuclear Engineering, School of Engineering, Nagoya University
    • OKAMOTO Katsumi
    • Department of Nuclear Engineering, School of Engineering, Nagoya University
    • YAMASAKI Tadashi
    • Electric Power Research & Development Center, Chubu Electric Power Co., Inc.

抄録

A new type of passive integrating cup monitors was developed by using a 50mm radius stainless steel hemisphere to measured indoor radon (<SUP>222</SUP>Rn) and thoron (<SUP>220</SUP>Rn) concentrations. By placing a pair of cup monitors with an air exchange opening of diameter 5mm and four openings of diameter 20mm at a 20cm distance from wall during about three months, the con- centrations of both gases could be assessed from the α track densities on the cellulose nitrate (CN) films. The <SUP>222</SUP>Rn and <SUP>220</SUP>Rn concentrations were surveyed with the cup monitors in the different types of dwellings around Nagoya in Japan over three years. The <SUP>220</SUP>Rn concentrations were rather high in the dwellings with soil wall, and the mean <SUP>220</SUP>Rn concentration was 160±12 Bq•m<SUP>-3</SUP>. The <SUP>220</SUP>Rn exhalation rate from wall and the <SUP>220</SUP>Rn diffusion were evaluated from the distribution of <SUP>220</SUP>Rn concentrations in the dwellings. The results of the surveys have also clarified the relationship between the <SUP>220</SUP>Rn concentrations at a 20cm distance from wall and the <SUP>220</SUP>Rn progeny concentrations measured in the same dwellings. Then, the annual mean effective dose equivalent due to <SUP>220</SUP>Rn progeny was expected to be 0.67mSv•yr<SUP>-1</SUP> in the dwellings with soil wall.

収録刊行物

  • Journal of nuclear science and technology

    Journal of nuclear science and technology 32(8), 794-803, 1995-08-25

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002072987
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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