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Purpose: <p>To solve the problem that the significant pump suction effect generated by traditional ventilation chambers leads to overestimated measurement results when measuring the radon exhalation rate from the soil surface using open-loop measurements.</p> Methods: <p>A novel ventilation chamber with three big air inlets was designed. Grouped comparative experiments were conducted: the first three sets used small air inlet chambers for open-loop measurements, while the last three used the novel big air inlet chambers. A radon diffusion-advection transport equation was applied to calculate radon exhalation rates under different pressure differences and soil compaction levels.</p> Results: <p>The open-loop radon exhalation rate measured by the ventilation chamber with small air inlets was several times higher than the closed-loop radon exhalation rate, while the open-loop radon exhalation rate obtained using the novel ventilation chamber with big air inlets was closely comparable to the closed-loop radon exhalation rate.</p> Conclusion: <p>The novel ventilation chamber with three big diameter air inlets on its side can effectively solve the problem of overestimated radon exhalation rate caused by the pump suction effect in open-loop measurements, significantly improve the accuracy of open-loop measurements.</p>

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A novel ventilation chamber design for effectively reducing the pump suction in open-loop measurements

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Haibo Yi,
  • Huiying Li,
  • Zhongkai Fan,
  • Jiulin Wu,
  • Jiale Sun,
  • Zhipeng Liu,
  • Chenxi Zu,
  • Hongbo Xu,
  • Shicheng Luo,
  • Xianfa Mao,
  • Xinyue Yang,
  • Feng Xiao,
  • Hongzhi Yuan,
  • Yanliang Tan

摘要

Purpose:

To solve the problem that the significant pump suction effect generated by traditional ventilation chambers leads to overestimated measurement results when measuring the radon exhalation rate from the soil surface using open-loop measurements.

Methods:

A novel ventilation chamber with three big air inlets was designed. Grouped comparative experiments were conducted: the first three sets used small air inlet chambers for open-loop measurements, while the last three used the novel big air inlet chambers. A radon diffusion-advection transport equation was applied to calculate radon exhalation rates under different pressure differences and soil compaction levels.

Results:

The open-loop radon exhalation rate measured by the ventilation chamber with small air inlets was several times higher than the closed-loop radon exhalation rate, while the open-loop radon exhalation rate obtained using the novel ventilation chamber with big air inlets was closely comparable to the closed-loop radon exhalation rate.

Conclusion:

The novel ventilation chamber with three big diameter air inlets on its side can effectively solve the problem of overestimated radon exhalation rate caused by the pump suction effect in open-loop measurements, significantly improve the accuracy of open-loop measurements.