基于"地理探测器"的珠三角地区地—空界面γ辐射场的空间分布差异影响机制研究OA

By integrating multi-source radioactivity survey data and using Geodetector,this study explored the spatial variations of the gamma radiation field at the ground-air interface and their influence mechanisms in the Pearl River Delta economic zone.The results in-dicate that key factors influencing the distribution of the radiation field include soil radon concentration(q=0.852),238U content(q=0.816),and 232Th content(q=0.803).Besides,formation lithology(q=0.791),fault structures(q=0.786),and chronostratigraphy(q=0.778)also play a significant role.The interaction detection indicates that the synergy of soil radon concentration and fault structures demonstrates the strongest explanatory power(q=0.875),suggesting the mechanism of structure-controlled transport and soil-controlled accumulation.Risk detection demonstrates that high-radiation radon contributors include normal faults,magmatic rocks,and Jurassic strata.The results of this study reveal that the spatial distribution of the radiation field is governed by a three-level system comprising nu-clide content as a direct source,lithology and chronostratigraphy as carriers,and fault structures as pathways for radon transport.The re-search results have provided a scientific basis for regional radiation environmental risk assessment and pollution prevention and control.