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Long-Term Measurements of Radon and Thoron Exhalation Rates from the Ground Using the Vertical Distributions of Their Activity Concentrations

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  • Oumar Bobbo Modibo

    (Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan
    Nuclear Technology Section, Institute of Geological and Mining Research, P.O. Box 4110, Yaoundé, Cameroon)

  • Yuki Tamakuma

    (Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan
    Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan)

  • Takahito Suzuki

    (Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan)

  • Ryohei Yamada

    (Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan)

  • Weihai Zhuo

    (Institute of Radiation Medicine, Fudan University, 2094 Xietu Road, Shanghai 200032, China)

  • Chutima Kranrod

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

  • Kazuki Iwaoka

    (National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-0024, Japan)

  • Naofumi Akata

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

  • Masahiro Hosoda

    (Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan
    Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan)

  • Shinji Tokonami

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

Abstract

A long-term measurement technique of radon exhalation rate was previously developed using a passive type radon and thoron discriminative monitor and a ventilated type accumulation chamber. In the present study, this technique was applied to evaluate the thoron exhalation rate as well, and long-term measurements of radon and thoron exhalation rates were conducted for four years in Gifu Prefecture. The ventilated type accumulation chamber (0.8 × 0.8 × 1.0 m 3 ) with an open bottom was embedded 15 cm into the ground. The vertical distributions of radon and thoron activity concentrations from the ground were obtained using passive type radon-thoron discriminative monitors (RADUETs). The RADUETs were placed at 1, 3, 10, 30, and 80 cm above the ground inside the accumulation chamber. The measurements were conducted from autumn 2014 to autumn 2018. These long-term results were found to be in good agreement with the values obtained by another methodology. The radon exhalation rates from the ground showed a clearly seasonal variation. Similar to findings of previous studies, radon exhalation rates from summer to autumn were relatively higher than those from winter to spring. In contrast, thoron exhalation rates were not found to show seasonal variation.

Suggested Citation

  • Oumar Bobbo Modibo & Yuki Tamakuma & Takahito Suzuki & Ryohei Yamada & Weihai Zhuo & Chutima Kranrod & Kazuki Iwaoka & Naofumi Akata & Masahiro Hosoda & Shinji Tokonami, 2021. "Long-Term Measurements of Radon and Thoron Exhalation Rates from the Ground Using the Vertical Distributions of Their Activity Concentrations," IJERPH, MDPI, vol. 18(4), pages 1-11, February.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:4:p:1489-:d:493487
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    References listed on IDEAS

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    1. Chutima Kranrod & Yuki Tamakuma & Masahiro Hosoda & Shinji Tokonami, 2020. "Importance of Discriminative Measurement for Radon Isotopes and Its Utilization in the Environment and Lessons Learned from Using the RADUET Monitor," IJERPH, MDPI, vol. 17(11), pages 1-15, June.
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    Cited by:

    1. Timofey Leshukov & Konstantin Legoshchin & Aleksey Larionov, 2023. "Radon Hazard of the Zhurinsky Fault for the Population in the Kuznetsk Coal Basin: Primary Results," Sustainability, MDPI, vol. 15(24), pages 1-14, December.

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