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<p>To investigate the effects of wildfire-induced structural changes in organic soils on radon release, nitrogen adsorption and radon exhalation experiments were conducted on soils with 1–5% organic matter under 100–600&#xa0;°C thermal treatments. Radon release was jointly controlled by organic matter and thermal disturbance, peaking at 3% organic matter, while higher contents reduced pore connectivity via cementation. Exhalation showed a nonlinear two-stage response: it increased linearly from 100 to 300&#xa0;°C, peaking when pore volume (0.0646&#xa0;cm<sup>3</sup>/g) and specific surface area (14.85&#xa0;m<sup>2</sup>/g) were maximal (~ 1.3 × the 100&#xa0;°C rate), then decreased by ~ 17% up to 600&#xa0;°C due to mineral transformation and pore collapse. This study provides a reference for radon risk assessment in high-temperature environments.</p>

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Study on the radon exhalation behavior of organic soils under high-temperature conditions

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Pengda Ma,
  • Qiang Sun,
  • Huiting Zhang,
  • Pengfei Li,
  • Weiqiang Zhang,
  • Wei Wang

摘要

To investigate the effects of wildfire-induced structural changes in organic soils on radon release, nitrogen adsorption and radon exhalation experiments were conducted on soils with 1–5% organic matter under 100–600 °C thermal treatments. Radon release was jointly controlled by organic matter and thermal disturbance, peaking at 3% organic matter, while higher contents reduced pore connectivity via cementation. Exhalation showed a nonlinear two-stage response: it increased linearly from 100 to 300 °C, peaking when pore volume (0.0646 cm3/g) and specific surface area (14.85 m2/g) were maximal (~ 1.3 × the 100 °C rate), then decreased by ~ 17% up to 600 °C due to mineral transformation and pore collapse. This study provides a reference for radon risk assessment in high-temperature environments.