基于GIS的土壤环境放射性水平和风险评价

doi:10.11720/wtyht.2023.1582

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Abstract

Investigating the concentrations of natural radionuclides in soils is basic for soil pollution prevention and control. First, this study determined the background values and anomaly thresholds of radionuclides ²³⁸U, ²²⁶Ra, ²³²Th, and ⁴⁰K in soils in Guangdong Province using the geographic information system (GIS) and three methods, namely conventional statistics, exploratory data analysis (EDA), and median absolute deviation (MAD). Then, this study assessed the radioactivity levels of the soil environment using four indices: the γ radiation dose rate, the equivalent radium specific activity, the external exposure index, and the annual effective dose rate. Finally, this study assessed the health risks of the soil radioactivity using the geoaccumulation index method, the single factor index method, and the Nemerow composite index method. The results indicate that: (1) Radionuclides ²³⁸U, ²²⁶Ra, ²³²Th, and ⁴⁰K in soils of Guangdong Province have average concentrations of 79.4, 102.95, 74.59, and 541.25 (Bq·kg^-1·dry), respectively; (2) The four radionuclides have background values of 34.27、46.75、32.87 and 271.79 (Bq·kg^-1·dry), and the anomaly values of 111.35、141.805、105.12、946.26 (Bq·kg^-1·dry); (3) The radioactivity level indices for soil environment, namely D, Ra_eq, Hex, and AEDR, show averages of 121.44 ± 67.08 nGy/h, 263.48 ± 147.72 Bq/kg, 0.08~2.3, and 148.93 ± 82.26 μSv/a, respectively; (4) The radionuclide geoaccumulation index suggests clean soils, the single factor index indicates slight pollution, and the Nemerow composite index of 0.22~5.52 (average: 1.74 ± 0.97) indicates mild pollution. These three indices, which suggest roughly consistent results for the health risk assessment of radionuclides in soils, can serve as a supplement to the health risk assessment method for soil radioactivity.

Key words： geographic information system soil radioactivity median absolute deviation method geoaccumulation index Guangdong Province

Received: 22 November 2022 Published: 27 October 2023

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	Ze-Sheng QUE
	Guan-Chao LI
	Ying HU
	Rui-Min JIAN
	Bing LIU

Cite this article:

Ze-Sheng QUE,Guan-Chao LI,Ying HU, et al. GIS-based assessment of the radioactivity levels and risks of soil environment[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1336-1347.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1582 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1336

Distribution of sampling sites

Statistics of specific activity of radionuclides in soil of study area

Correlation coefficient between radionuclides in soil of study area

Statistics of background value and abnormal limit of radioactivity in soil

Soil environmental radioactivity level distribution map

Soil risk assessment distribution map based on geo-accumulation index method

Soil risk assessment distribution map based on Nemero comprehensive index method

Radionuclide distribution in soil of granite

Radionuclide distribution in soil within different geological structure buffer zones

Spatial relationship between radioactive anomaly area of soil environment and geological factors

Radionuclide distribution in soils of different landforms

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