Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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Distribution of natural radionuclide in the Geum river sediment

금강수계 퇴적물 중 천연 방사성핵종 분포 조사

  • Seol, Bitna (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Cho, Yoonhae (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Min, Kyungok (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Wansuk (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Oh, Dayeon (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Kil, Gibeom (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Yang, Yunmo (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Lee, Junbae (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Kim, Byungik (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Cheon, Seok (Geum River Environment Research Center, National Institute of Environmental Research)
  • 설빛나 (국립환경과학원 금강물환경연구소) ;
  • 조윤해 (국립환경과학원 금강물환경연구소) ;
  • 민경옥 (국립환경과학원 금강물환경연구소) ;
  • 김완석 (국립환경과학원 금강물환경연구소) ;
  • 오다연 (국립환경과학원 금강물환경연구소) ;
  • 길기범 (국립환경과학원 금강물환경연구소) ;
  • 양윤모 (국립환경과학원 금강물환경연구소) ;
  • 이준배 (국립환경과학원 금강물환경연구소) ;
  • 김병익 (국립환경과학원 금강물환경연구소) ;
  • 천세억 (국립환경과학원 금강물환경연구소)
  • Received : 2017.03.07
  • Accepted : 2017.06.30
  • Published : 2017.10.25
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Abstract

The concentration of natural radioactivity in the sediment of the Geum River was investigated. The river and lake sediment samples were collected at 23 points during September to November, 2015 and March to April, 2015, respectively. The gamma-rays emitted from the $^{226}Ra$ and $^{232}Th$ decay series and $^{40}K$ were measured with a high purity germanium (HPGe) gamma detector. The average radioactivity concentrations of the $^{226}Ra$, $^{232}Th$ decay series and $^{40}K$ for the river sediment was found to be $15.6{\pm}0.6$, $33.8{\pm}1.2$, $789.8{\pm}26.0Bq/kg$, respectively, while for the lake sediment, the concentrations were $17.1{\pm}0.5$, $37.8{\pm}1.1$, $269.4{\pm}9.6Bq/kg$, respectively. Spearman's correlation was conducted to compare the radioactivity concentration and properties of the sediment. The radioactivity concentration of the $^{232}Th$ decay series showed a negative correlation with the particle size of the sediment, and was measured to be higher than the $^{226}Ra$ decay series according to mobility of the radionuclides. The radioactivity concentration of $^{40}K$ showed a negative correlation with organic matter content. The concentration of $^{40}K$ in the lake sediment was lower than that in the river sediment.

금강수계 하천 및 호소 퇴적물에 대하여 천연 방사성핵종 농도를 조사하였다. 조사의 대상이 되는 지점은 하천 17 개 지점, 호소 6 개 지점으로 총 23 개 지점이며, 하천은 2015년 9월부터 11월, 호소는 2015년 3월부터 4월까지 시료를 채취하였다. 분석 대상 핵종은 $^{226}Ra$ 계열, $^{232}Th$ 계열과 $^{40}K$ 핵종이며, 고순도 게르마늄 검출기(HPGe)를 이용하여 대상 핵종 또는 그 자핵종이 방출하는 감마선을 계측하였다. 분석 결과 하천 퇴적물 중 $^{226}Ra$계열, $^{232}Th$ 계열과 $^{40}K$의 방사성핵종 농도는 각각 $15.6{\pm}0.6$, $33.8{\pm}1.2$, $789.8{\pm}26.0Bq/kg$ 으로 나타났으며, 호소 퇴적물의 농도는 각각 $17.0{\pm}0.5$, $37.8{\pm}1.1$, $269.4{\pm}9.6Bq/kg$으로 나타났다. $^{232}Th$ 계열 방사성핵종의 농도는 퇴적물 입도와 연관성을 보였으며, 핵종의 이동 특성에 따라 $^{226}Ra$ 계열보다 높게 나타났다. $^{40}K$의 농도는 퇴적물 중 유기물 함량과 관련을 보였으며, 하천에 비하여 호소에서 낮은 농도로 조사되었다.

Keywords

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