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Research Article

Uranium and Radon Concentrations in Groundwater of the Daejeon Granite Area: Comparison with Other Granite Areas

대전 화강암지역 지하수의 우라늄과 라돈 함량: 다른 화강암지역과의 비교

Uk Yun1
,
Moon Su Kim2
,
Do Hwan Jeong3
,
Jae Hong Hwang4
,
Byong Wook Cho1*
윤 욱1
,
김 문수2
,
정 도환3
,
황 재홍4
,
조 병욱1*
1Groundwater and Ecohydrology Research Center, Korea Institute of Geoscience and Mineral Resources, Principal Researcher
2Soil and Groundwater Research Division, National Institute of Environmental Research, Senior Researcher, Senior Researcher
3Soil and Groundwater Research Division, National Institute of Environmental Research, Environmental Researcher
4Geoscience Data Center, Korea Institute of Geoscience and Mineral Resources, Principal Researcher
1한국지질자원연구원 지하수연구센터, 책임연구원
2국립환경과학원 토양지하수연구과, 환경연구관
3국립환경과학원 토양지하수연구과, 환경연구사
4한국지질자원연구원 지질자원데이터센터, 책임연구원
* Corresponding Author
31 December 2018. pp. 631-643
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Abstract

Uranium and radon concentrations in groundwater from 80 wells from Daejeon area were measured to determine the range of concentrations according to the geology. The median uranium content of groundwater was 11.14 µg/L for the two-mica granite, 0.90 µg/L for the biotite granite, and 0.47 µg/L for the Ogcheon group. The median radon content of groundwates was 114.3 Bq/L for the two-mica granite, 61.6 Bq/L for the biotite granite, and 42.2 Bq/L for the Ogchon group, respectively. The uranium content of two-mica granite is 3.78 mg/ kg, which is slightly higher than that of biotite granite 3.20 mg/kg. However, the uranium content in groundwatewr of two-mica granite groundwater is much higher than that of biotite granite. This can be explained by the fact that the two-mica granite is vulnerable to weathering than biotite granite, so uranium in mineral is easily leached into groundwater. The exceeding rate of samples having uranium content above 30 µg / L in granite area was 23.8%, which is higher than that of 6.7% in Jurassic granite in Korea. On the other hand, the exceeding rate of samples having radon content above 148 Bq/L in granite rate area was 31.0% which is similar to that of Jurassic granite area of 31.7%.

Keywords
groundwater
uranium concentration
radon concentration
two-mica granite

대전지역의 지질별 지하수의 우라늄, 라돈함량을 파악하기 위하여 80개의 지하수를 채취하였다. 지질별 지하수의 우라늄 함량 중앙값은 복운모화강암지역은 11.14 µg/L, 흑운모화강암지역은 0.90 µg/L, 옥천 층군은 0.47 µg/L으로 복운모화강암지역에서 월등히 높았다. 지질별 지하수의 라돈 함량 중앙값은 복운모화강암지역은 114.3 Bq/L, 흑운모 화강암지역은 61.6 Bq/L, 옥천층군은 42.2 Bq/L로 나타나 지질별 지하수의 우라늄 함량 차이만큼 현지하지는 않았다. 연구지역 복운모화강암의 우라늄 평균함량은 3.78 mg/kg으로 흑운모화강암의 3.20 mg/kg보다 약간 높지만 지하수의 우라늄 함량은 월등히 높다. 이는 복운모화강암은 흑운모화강암에 비하여 풍화에 약하여 광물내 우라늄이 지하수로 쉽게 용출되는 것으로 설명될 수 있으나 추가 연구가 필요하다. 지하수의 우라늄 함량에 비해서 복운모화강암과 흑운모화강암지역 지하수의 라돈 함량에 큰 차이가 없는 것은 복운모화강암지역은 풍화에 약하기 때문에 지하수내 라돈이 대기로 쉽게 빠져나가기 때문으로 판단된다. 연구지역 복운모화강암지역 지하수의 우라늄 함량이 30 µg/L를 초과하는 비율은 23.8%로 국내 쥬라기화강암의 초과율인 6.7%보다도 높으나 라돈함량이 148 Bq/L를 초과하는 비율은 31.0%로 국내 쥬라기화강암지역의 초과율인 31.7%와 비슷하다.

키워드
지하수
우라늄
라돈
함량
복운모화강암
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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 : 28
  • No :4
  • Pages :631-643
  • Received Date : 2018-11-05
  • Revised Date : 2018-12-08
  • Accepted Date : 2018-12-13
  • DOI :https://doi.org/10.9720/kseg.2018.4.631
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