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2019 Vol.29, Issue 4 Preview Page

Research Article

Assessment of Gamma-radiation dose Rate in the Ogcheon Lower Phyllite Area, Goesan County, Korea, Using Gamma-ray Spectrometry

감마선분광분석기를 이용한 괴산 옥천하부천매암대 일대의 감마선량 평가

Uk Yun1
,
Byong-Wook Cho1*
윤 욱1
,
조 병욱1*
1Principal Researcher, Groundwater Research Center, Korea Institute of Geoscience and Mineral Resources
1한국지질자원연구원 지하수연구센터 책임연구원
*Corresponding Author
31 December 2019. pp. 461-468
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Abstract

Gamma-radiation dose rates were measured at 77 points around the Ogcheon lower phyllite zone (og2) in Goesan County, Korea, using gamma-ray spectrometry. Sample K contents were in the range 1.8-8.8% (average 4.6%), highest in Kgr. The eU contents were 0.2-217.9 ppm (average 16.7 ppm), highest in og2 (median 29.6 ppm). The eTh contents were 11.9-76.5 ppm (average 29.5 ppm) and the average eTh content of Kgr was 45.4 ppm, higher than those of Ogcheon meta-sedimentary rocks (og1, og2, and og3) (26.6-30.6 ppm). Except for some high-uranium sites in og2, 40K is the main radioactive material contributing to the gamma-radiation dose in the study area. Our results indicate that the outdoor effective dose rate of the area is 0.08-1.71 mSv y-1 (average 0.28 mSv y-1), with most areas apart from three points in og2 displaying dose rates <1 mSv y-1, which is the normal natural radiation background level.

Keywords
gamma-ray spectrometry
Ogcheon lower phyllite zone
gamma-radiation dose rate
effective dose rate

휴대용 감마선분광분석기를 이용하여 괴산지역 옥천하부천매암대(og2) 주변 일대 77개 지점에서 감마선량을 측정하였다. 전체 시료의 40K 함량은 1.8-8.8% 범위(평균 4.6%)로 Kgr에서 함량이 가장 높았으며, eU의 함량 범위는 0.2-217.9 ppm (평균 16.7 ppm)인데 og2에서 가장 높았으며(중앙값 29.6 ppm)다. eTh의 함량 범위는 11.9-76.5 ppm (평균 29.5 ppm) 이었는데 Kgr의 평균 함량은 45.4 ppm으로 og1, og2, og3의 함량(26.6-30.6 ppm)보다 높았다. og2에 속하는 일부 고 우라늄 지점을 제외한 연구지역의 감마선량에 기여하는 방사성물질은 40K가 절대적이다. 연구지역의 옥외 유효선량률은 0.08-1.71 mSv/y (평균 0.28 mSv/y)의 범위로 나타났다. 유효선량률이 1 mSv를 넘는 지점은 함 우라늄 층이 협재된 og2의 덕평리지역 3지점이며 이를 제외한 나머지 대부분 지역은 정상적인 자연방사선지역에 해당한다.

키워드
감마선분광분석기
옥천하부천매암대
감마선량
유효선량률
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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 : 29
  • No :4
  • Pages :461-468
  • Received Date : 2019-10-31
  • Accepted Date : 2019-12-03
  • DOI :https://doi.org/10.9720/kseg.2019.4.461
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