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  • Title: Distribution of radon and risk assessment of its radiation dose in groundwater drinking for village people nearby the W-polymetallic metallogenic district at Dongpo in southern Hunan province, China.
    Author: Tan W, Li Y, Tan K, Xie Y, Han S, Wang P.
    Journal: Appl Radiat Isot; 2019 Sep; 151():39-45. PubMed ID: 31158704.
    Abstract:
    Radon in the household water (especially groundwater) which is an important source of indoor radon, has become a potential health hazard to residents. In this study, radon concentrations in groundwater sampled from five villages near Dongpo W-polymetallic metallogenic region were measured using RAD-7 detector with RAD H2O accessory, and the effect of regional geology and mineralization on radon concentration in groundwater was studied. In addition, we also estimated the radiation doses received by people via ingestion of radon in water and inhalation of the radon from the indoor air while using water. The results show that the radon concentration in groundwater samples varies from 1.29 Bq L-1 to 31.31 Bq L-1 with 10.47 Bq L-1 on average, and about 31.3% of the groundwater samples analyzed have a higher radon concentration than the maximum contaminant level of 11.1 Bq L-1 recommended by United States Environmental Protection Agency (USEPA). The relatively high radon level in groundwater can be attributed to a relatively high uranium background produced by the magmatic activity and magmatic-hydrothermal system. The values of annual effective dose (AEDing) due to ingestion of radon in groundwater range from 0.002 mSv y-1 to 0.055 mSv y-1, 0.005 mSv y-1 to 0.11 mSv y-1 and 0.008 mSv y-1 to 0.188 mSv y-1 for adult, child and infant respectively. The values of annual effective dose due to the inhalation of radon released from water are 63.6, 15.4 and 3.8 times of those through the ingestion of radon in groundwater by the adults, children and infants, respectively. In addition, the values of estimated total annual effective doses are 0.020-0.480 mSv y-1, 0.017-0.406 mSv y-1 and 0.020-0.484 mSv y-1 for adult, child and infant, respectively. These values are much lower than the reference dose level of 1 mSv y-1 recommended by World Health Organization (WHO) and United Nations Scientific Committee on the Effect of Atomic Radiation (UNSCEAR).
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