Original Article

Econ. Environ. Geol. 2017; 50(5): 353-361

Published online October 31, 2017

https://doi.org/10.9719/EEG.2017.50.5.353

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Uranium Concentrations in Groundwater of the Goesan Area, Korea

Byong-Wook Cho*

Groundwater and Ecohydrology Research Center, Korea Institute of Geoscience and Mineral Resources

Correspondence to : cbw@kigam.re.kr

Received: September 4, 2017; Revised: October 13, 2017; Accepted: October 18, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

Uranium concentration in groundwater of the Goesan area was anticipated high because the area contains Ogcheon metamorphic rock zone which partly includes coal bed bearing high uranium content and nearly half of the area is covered by granitic rocks. Groundwater samples collected from 250 wells in five 5 lithology (Ogcheon meta-sandy rock zone (Og1), Ogcheon lower phyllite zone (Og2), Ogcheon pebble bearing phyllite zone (Og3), Jurassic granite (Jgr), Cretaceous granite (Kgr)), of the area were analyzed and equivalent uranium concentrations (e(U)) from 200 rocks near sampled wells were measured using portable gamma spectrometry. Higher median value of e(U) (8.2 mg/kg) was found on Kgr outcrops. The median e(U) value of Og2 was not as high as that of Kgr and similar to those of Jgr, Og1, and Og3 (3.05~3.90 mg/kg). The uranium level in groundwater of the area ranged from 0.01 to 293.0 μg/L with a median value of 0.87 μg/L which is similar to the national median uranium level of 0.74 μg/L. The uranium concentration was high in the samples from the Kgr (median 4.74 μg/L) and low samples from the Og1, Og2, and Og3 (median 0.35~0.74 μg/L). The percentage of total samples having uranium level above 30 μg/L was 2.8%, on the other hand, that of Kgr is 20.7%, reflecting additional survey on the Kgr area is needed.

Keywords groundwater, uranium concentration, Jurassic granite (Jgr), Cretaceous granite (Kgr), Ogcheon metamorphic rock zone

괴산지역 지하수의 우라늄 함량

조병욱*

한국지질자원연구원 지하수생태연구센터

요 약

Article

Original Article

Econ. Environ. Geol. 2017; 50(5): 353-361

Published online October 31, 2017 https://doi.org/10.9719/EEG.2017.50.5.353

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Uranium Concentrations in Groundwater of the Goesan Area, Korea

Byong-Wook Cho*

Groundwater and Ecohydrology Research Center, Korea Institute of Geoscience and Mineral Resources

Correspondence to:cbw@kigam.re.kr

Received: September 4, 2017; Revised: October 13, 2017; Accepted: October 18, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

Uranium concentration in groundwater of the Goesan area was anticipated high because the area contains Ogcheon metamorphic rock zone which partly includes coal bed bearing high uranium content and nearly half of the area is covered by granitic rocks. Groundwater samples collected from 250 wells in five 5 lithology (Ogcheon meta-sandy rock zone (Og1), Ogcheon lower phyllite zone (Og2), Ogcheon pebble bearing phyllite zone (Og3), Jurassic granite (Jgr), Cretaceous granite (Kgr)), of the area were analyzed and equivalent uranium concentrations (e(U)) from 200 rocks near sampled wells were measured using portable gamma spectrometry. Higher median value of e(U) (8.2 mg/kg) was found on Kgr outcrops. The median e(U) value of Og2 was not as high as that of Kgr and similar to those of Jgr, Og1, and Og3 (3.05~3.90 mg/kg). The uranium level in groundwater of the area ranged from 0.01 to 293.0 μg/L with a median value of 0.87 μg/L which is similar to the national median uranium level of 0.74 μg/L. The uranium concentration was high in the samples from the Kgr (median 4.74 μg/L) and low samples from the Og1, Og2, and Og3 (median 0.35~0.74 μg/L). The percentage of total samples having uranium level above 30 μg/L was 2.8%, on the other hand, that of Kgr is 20.7%, reflecting additional survey on the Kgr area is needed.

Keywords groundwater, uranium concentration, Jurassic granite (Jgr), Cretaceous granite (Kgr), Ogcheon metamorphic rock zone

괴산지역 지하수의 우라늄 함량

조병욱*

한국지질자원연구원 지하수생태연구센터

Received: September 4, 2017; Revised: October 13, 2017; Accepted: October 18, 2017

요 약

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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