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Study on the natural radioactivity level of stone coal-bearing strata in East China

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Abstract

Based on γ-radiation dose rate and radon concentration measurements and 238U, 232Th, 226Ra, and 40K radionuclide testing, this study identifies the radioactive anomalies of stone coal-bearing strata in East China and evaluates the natural radioactivity levels in the air, solid, water and plant media in the typical area of the regional stone coal-bearing layers. The stone coal-bearing strata in East China occur in the lower Cambrian system along the margin of the Yangtze block; additionally, the radioactive anomaly area is sporadically distributed in the stone coal-bearing layers. The background values of 238U, 232Th, 226Ra, and 40K are higher in the stone coal-bearing areas, and the spatial distribution of these natural radionuclides shows significant variability. 238U and 226Ra clearly accumulate in the coal, coal gangue and soil and are the main sources of the environmental radiation in coal mines. The γ-radiation shows a higher background value in the stone coal-bearing area, and this radioactive pollution cannot be ignored. Typically, the effective dose of γ-radiation exceeds the limit value of 5 mSv/a, and the total α and total β concentrations of the groundwater are 10–30 times the limit value at some points. The residents near the mining area are subjected to a higher radiation dose, and the groundwater, building materials, and plants have been contaminated by the radioactive pollution sporadically through time. It is necessary to strengthen the monitoring work of radioactive environments and to take appropriate control measures.

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Acknowledgements

This work was funded by grants of the Natural Science Foundation of Jiangsu Province (BK20151093) and the Chinese Project of the National Geological Survey (DD20160135).

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Authors and Affiliations

  1. Nanjing Center, China Geological Survey, Nanjing, 210016, China

    Naizheng Xu, Fuxiang Kuang & Hongying Liu

  2. Jiangxi Nuclear Industry Geological Bureau Testing Center, Nanchang, 330002, China

    Xinxiang Wei & Linxi Zhang

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  1. Naizheng Xu
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  2. Xinxiang Wei
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  3. Fuxiang Kuang
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  4. Linxi Zhang
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  5. Hongying Liu
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Correspondence to Naizheng Xu.

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Xu, N., Wei, X., Kuang, F. et al. Study on the natural radioactivity level of stone coal-bearing strata in East China. Environ Earth Sci 77, 726 (2018). https://doi.org/10.1007/s12665-018-7916-2

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  • DOI: https://doi.org/10.1007/s12665-018-7916-2

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