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http://dx.doi.org/10.9720/kseg.2020.4.577

Evaluation of Terrestrial Gamma Radiation and Dose Rate of the Ogcheon Group Area  

Yun, Uk (Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources)
Cho, Byong-Wook (Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources)
Publication Information
The Journal of Engineering Geology / v.30, no.4, 2020 , pp. 577-588 More about this Journal
Abstract
We evaluated the distributions of primordial radionuclides and effective dose rate of the Ogcheon Group, which includes rocks with high uranium content. Terrestrial gamma radiation was measured at 421 points using a portable gamma ray spectrometer. Dividing the study area into five geological units (og1, og2, og3, og4, and igneous rocks) revealed no significant difference in the concentration of surface radioactivity among the types. The concentrations of 40K, eU, and eTh for all samples ranged from 0.7% to 10.3% (average 5.2%), 0.6 to 287.0 ppm (average 8.5 ppm), and 4.0 to 102.4 ppm (average 31.3 ppm), respectively. The absorbed dose rate in the study area (calculated from the activity concentrations of 40K, eU, and eTh) was in the range of 28.84 to 1,714.5 nGy/h (average 195.4 nGy/h). Among the five geological units, the lowest average was 166.3 nGy/h (for og1) and the highest average was 233.3 nGy/h (for og2; median 198.1 nGy/h). The outdoor effective dose rate for the area obtained from the absorbed dose rate was in the range of 0.04 to 2.10 mSv/y (average 0.24 mSv/y). Except for the four sites located in the uranium-bearing coal bed of og2, none of the studied sites exceeded 1 mSv/y.
Keywords
gamma ray spectrometry; gamma dose rate; terrestrial gamma radiation; Ogcheon group; absorbed dose rate; effective dose rate;
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Times Cited By KSCI : 5  (Citation Analysis)
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