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<p>To systematically explore the influence mechanism of geological background and human activities on the regional radioactive environment, this study selected Chengmai County, Hainan Province as a typical case. Based on 1:50,000 radioactive geological environment survey data, the study area was first divided into 6 lithological sub-regions according to lithological assemblage characteristics. The spatial distribution characteristics of radionuclides <sup>40</sup>K, <sup>238</sup>U, and <sup>232</sup>Th within the sub-region were quantitatively analyzed using the geochemical contrast method. Based on this, the correlation between the radioactivity of the three nuclides and stratigraphic type was analyzed to determine the influence of geological genesis on the regional radioactivity level. A comprehensive evaluation system was constructed from four dimensions: specific activity of natural radionuclides, internal exposure index, external exposure index, and annual effective dose, to systematically assess the radioactive geological environment quality of Chengmai County. The results show that the natural radionuclides <sup>40</sup>K, <sup>238</sup>U, and <sup>232</sup>Th in Chengmai County are generally distributed at low levels, with high-value areas mainly concentrated in the central and northern parts of the study area. Further comprehensive analysis, incorporating multi-source information from geological structure, land use, and human activities, identified three relatively radioactive anomaly zones (numbered I-III) characterized by <sup>40</sup>K anomalies and localized <sup>238</sup>U and <sup>232</sup>Th anomalies. The causes of these regional radioactive anomalies were analyzed from both geological and human activity perspectives. Finally, based on the causes of the anomalies, substantive countermeasures and suggestions were proposed from multiple aspects, including radioactive monitoring and management, protection of ecological functional zones, and ecological environment zoning control, aiming to provide a basis for the scientific management and risk prevention of the regional radioactive environment.</p>

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Analysis and countermeasures of regional radioactive anomalies caused by geological genesis and human activities

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月1日

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  • Huazhu Chen,
  • Linfang Xiu,
  • Xia Wang,
  • Shengzhou Xie,
  • Wenbo Mo,
  • Wei Huang,
  • Qijian Wang,
  • Guanyu Deng,
  • Zijian Jiang

摘要

To systematically explore the influence mechanism of geological background and human activities on the regional radioactive environment, this study selected Chengmai County, Hainan Province as a typical case. Based on 1:50,000 radioactive geological environment survey data, the study area was first divided into 6 lithological sub-regions according to lithological assemblage characteristics. The spatial distribution characteristics of radionuclides 40K, 238U, and 232Th within the sub-region were quantitatively analyzed using the geochemical contrast method. Based on this, the correlation between the radioactivity of the three nuclides and stratigraphic type was analyzed to determine the influence of geological genesis on the regional radioactivity level. A comprehensive evaluation system was constructed from four dimensions: specific activity of natural radionuclides, internal exposure index, external exposure index, and annual effective dose, to systematically assess the radioactive geological environment quality of Chengmai County. The results show that the natural radionuclides 40K, 238U, and 232Th in Chengmai County are generally distributed at low levels, with high-value areas mainly concentrated in the central and northern parts of the study area. Further comprehensive analysis, incorporating multi-source information from geological structure, land use, and human activities, identified three relatively radioactive anomaly zones (numbered I-III) characterized by 40K anomalies and localized 238U and 232Th anomalies. The causes of these regional radioactive anomalies were analyzed from both geological and human activity perspectives. Finally, based on the causes of the anomalies, substantive countermeasures and suggestions were proposed from multiple aspects, including radioactive monitoring and management, protection of ecological functional zones, and ecological environment zoning control, aiming to provide a basis for the scientific management and risk prevention of the regional radioactive environment.