Derivation and Validity Evaluation of Calibration Factors for Activated-charcoal Radon Collectors

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  • Wakabayashi Akiko
    Department of Biophysical Chemistry, Kobe Pharmaceutical University
  • Yasuoka Yumi
    Radioisotope Research Center, Kobe Pharmaceutical University
  • Janik Miroslaw
    Center for Advanced Radiation Emergency Medicine, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology
  • Nagahama Hiroyuki
    Department of Geoenvironmental Science, Graduate School of Science, Tohoku University
  • Fukuhori Nobutoshi
    Central Research Laboratory, Shiga University of Medical Science
  • Mori Yasunori
    Mie Prefecture Health and Environment Research Institute
  • Arai Yuria
    Department of Biophysical Chemistry, Kobe Pharmaceutical University
  • Fujii Satomi
    Radioisotope Research Center, Kobe Pharmaceutical University
  • Mukai Takahiro
    Department of Biophysical Chemistry, Kobe Pharmaceutical University

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Other Title
  • 活性炭ラドン収集器の校正係数の導出とその有効性評価

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Abstract

<p>Radon collectors (e.g., PicoRad collectors) based on activated-charcoal have been used for screening and measuring radon. However, researchers at the U. S. Environmental Protection Agency reported that they could not verify the proper functioning of some commercially available radon detectors, including PicoRad collectors. In this study, we exposed two lots (with different expiration dates) of PicoRad collectors to the reference conditions at a controlled radon concentration within a radon chamber because the calibration factors were derived for use by a semi-empirical equation. Further, we exposed the PicoRad collectors to an uncontrolled radon atmosphere for conducting validity evaluation. The radon concentration results obtained by the PicoRad collectors using the semi-empirical equation were observed to be in good agreement with the conventional true radon concentration value. It denoted the optimal value of a quantity determined using a reference instrument. These experiments revealed that different values were required for the factors of the conversion equation of each radon collector lot with a different expiration date.</p>

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 68 (5), 317-329, 2019-05-15

    Japan Radioisotope Association

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