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  • 한국과학기술정보연구원(KISTI) 서울분원 대회의실(별관 3층)
  • 2024년 07월 03일(수) 13:30
 

  • P-ISSN1225-0163
  • E-ISSN2288-8985
  • SCOPUS, ESCI, KCI

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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

금강수계 퇴적물 중 천연 방사성핵종 분포 조사

Distribution of natural radionuclide in the Geum river sediment

분석과학 / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2017, v.30 no.5, pp.262-269
https://doi.org/10.5806/AST.2017.30.5.262
설빛나 (국립환경과학원)
조윤해 (국립환경과학원)
민경옥 (국립환경과학원)
김완석 (국립환경과학원)
오다연 (국립환경과학원)
길기범 (국립환경과학원)
양윤모 (국립환경과학원)
이준배 (국립환경과학원)
김병익 (국립환경과학원)
천세억 (국립환경과학원)
  • 다운로드 수
  • 조회수

초록

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

keywords
natural radionuclide, Geum river, sediment, gammy-ray

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 226Ra and 232Th decay series and 40K were measured with a high purity germanium (HPGe) gamma detector. The average radioactivity concentrations of the 226Ra, 232Th decay series and 40K for the river sediment was found to be 15.6 ± 0.6, 33.8 ± 1.2, 789.8 ± 26.0 Bq/kg, respectively, while for the lake sediment, the concentrations were 17.1 ± 0.5, 37.8 ± 1.1, 269.4 ± 9.6 Bq/kg, respectively. Spearman’s correlation was conducted to compare the radioactivity concentration and properties of the sediment. The radioactivity concentration of the 232Th decay series showed a negative correlation with the particle size of the sediment, and was measured to be higher than the 226Ra decay series according to mobility of the radionuclides. The radioactivity concentration of 40K showed a negative correlation with organic matter content. The concentration of 40K in the lake sediment was lower than that in the river sediment.

keywords
natural radionuclide, Geum river, sediment, gammy-ray


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