<p>Radon-222 (<sup>222</sup>Rn) flux density in transitional urban landscapes remains poorly understood despite its health implications. This study analyzes its surface flux in Hengyang City by integrating environmental drivers through a geographical detector framework. Results demonstrate that barometric pressure, soil temperature, and salinity exert dominant influences, while vegetation and built-up areas play minor roles. Factor interactions reveal nonlinear synergies, substantially improving explanatory power. Spatial risk assessment highlights heterogeneous impacts of barometric pressure and urbanization. The study provides a novel, data-driven basis for monitoring radon flux and guiding public health protection in mixed urban–peri-urban settings.</p>

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Quantitative analysis of driving factors of 222Rn flux density in the mixed urban and peri-urban region of partial Hengyang City using the geographical detector model

  • Xueli Xu,
  • Bo Lei,
  • Xiaoxiao Zhou,
  • Lingjuan Zhao,
  • Huinan Zhou

摘要

Radon-222 (222Rn) flux density in transitional urban landscapes remains poorly understood despite its health implications. This study analyzes its surface flux in Hengyang City by integrating environmental drivers through a geographical detector framework. Results demonstrate that barometric pressure, soil temperature, and salinity exert dominant influences, while vegetation and built-up areas play minor roles. Factor interactions reveal nonlinear synergies, substantially improving explanatory power. Spatial risk assessment highlights heterogeneous impacts of barometric pressure and urbanization. The study provides a novel, data-driven basis for monitoring radon flux and guiding public health protection in mixed urban–peri-urban settings.