Distribution and Change of Radon Concentration of Groundwater in the Area of Yeonpung-myeon, Goesan-gun, Korea

Byong-Wook Cho; Soo-Young Cho; Jong-Hyun Oh; Byeong-Dae Lee

doi:10.9720/kseg.2023.4.587

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2023 Vol.33, Issue 4 Preview Page Next Page

Research Article

Distribution and Change of Radon Concentration of Groundwater in the Area of Yeonpung-myeon, Goesan-gun, Korea 괴산군 연풍면 일대 지하수 중 라돈 함량 분포와 변동

31 December 2023. pp. 587-598

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Abstract

To assess the distribution and temporal changes in radon concentration within a region in Yeonpung-myeon, Goesan-gun, known for elevated groundwater radon levels, we conducted a series of analyses, measuring radon concentration and DTW (Depth to water table) at 2-month intervals over 12 cycles. The investigation covered 10 groundwater wells and one stream within the designated area. The groundwater in the central part of the region exhibited high radon concentrations, ranging from 37.0 to 2,675.2 Bq/L. Conversely, the peripheral zones displayed comparatively lower radon concentrations, ranging from 10.6 to 37.9 Bq/L. This variation is attributed to the presence of granite porphyry that intruded into the Okcheon Formation, forming a fracture zone and contributing to elevated radon levels in the central part. In contrast, the peripheral locations, located within the Okcheon Formation and away from the granite porphyry intrusion, demonstrated lower radon concentrations. The observed significant fluctuation in radon concentration in the central area is associated with its low-lying topography. The pronounced seasonal changes in groundwater levels contribute to the migration of shallow, low-radon groundwater into areas with higher radon concentrations, explaining the observed variations in radon levels within the central part of the studied area.

Keywords

groundwater

radon

concentration

granite porphyry

Okcheon Formation

지하수의 라돈 함량이 높은 것으로 알려진 연구지역 지하수의 라돈 함량분포와 시기별 함량변화를 파악하기 위하여 10개 지하수공과 1개 하천수를 대상으로 2개월 간격으로 12회에 걸쳐서 라돈 함량 분석과 DTW(Depth to water table)를 측정하였다. 연구지역 중앙에 위치한 지하수의 라돈 함량은 37.0~2,675.2 Bq/L로 높았으나 연구지역 외곽에서는 10.6~37.9 Bq/L로 낮았다. 연구지역 중앙에 위치한 지하수의 라돈 함량이 높은 것은 옥천층군을 관입한 화강반암과 이에 따른 파쇄대가 발달하였기 때문으로 해석된다. 연구지역 외곽에 위치한 지하수의 라돈 함량이 낮은 것은 화강반암 관입부로부터 떨어진 옥천층군에 위치하고 있기 때문으로 해석된다. 연구지역 중앙에 위치한 지하수의 라돈 함량 변화가 크게 일어나는 것은 연구지역 중앙이 저지대일 뿐만 아니라 계절별 지하수위 변화가 크게 일어나며 이로 인해 천부의 저 함량 라돈 지하수가 고 함량 라돈 지하수에 유입되기 때문으로 보인다.

키워드

지하수

라돈

함량

화강반암

옥천층군

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 33
No :4
Pages :587-598
Received Date : 2023-11-27
Revised Date : 2023-12-11
Accepted Date : 2023-12-13
DOI :https://doi.org/10.9720/kseg.2023.4.587

The Journal of Engineering GeologyISSN:1226-5268(Print) 2287-7169(Online)대한지질공학회

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