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
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.