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An Improved Passive CR-39-Based Direct 222 Rn/ 220 Rn Progeny Detector

Author

Listed:
  • Jun Hu

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki 036-8564, Japan)

  • Guosheng Yang

    (National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan)

  • Chutima Kranrod

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki 036-8564, Japan)

  • Kazuki Iwaoka

    (National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan)

  • Masahiro Hosoda

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki 036-8564, Japan
    Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki 036-8564, Japan)

  • Shinji Tokonami

    (Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki 036-8564, Japan)

Abstract

An improved passive CR-39-based direct 222 Rn/ 220 Rn progeny detector with 3 detection channels was designed and tested in this study to measure and calculate equilibrium equivalent concentration (EEC) of both 222 Rn and 220 Rn without the equilibrium factor. A theoretical model was established to calculate the EEC with optimization. Subsequently, an exposure experiment was carried out to test the performance of this detector, and we compared the chamber experiment and the theoretical model by estimating and measuring various parameters. The deposition flux of progeny derived from the prediction agreed well with the value measured in the exposure chamber. The energy-weighted net track density (NTD) measured by this detector is much more reliable to reflect the linear relation between NTD and time-integrated EEC. Since the detector is sensitive to the exposure environmental condition, it is recommended to apply the detector to measure the EEC after its calibration in a typical indoor environment.

Suggested Citation

  • Jun Hu & Guosheng Yang & Chutima Kranrod & Kazuki Iwaoka & Masahiro Hosoda & Shinji Tokonami, 2020. "An Improved Passive CR-39-Based Direct 222 Rn/ 220 Rn Progeny Detector," IJERPH, MDPI, vol. 17(22), pages 1-13, November.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:22:p:8569-:d:447307
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