Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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The distribution of 137Cs activities in sediment samples of South-Han River basin

남한강수계 하천 퇴적물 시료 중 137Cs 분포

  • Kim, Jiyu (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Kang, Tae-Woo (Yeongsan-River Environment Research Center, National Institute of Environmental Research) ;
  • Hong, Jung-Ki (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • An, Mijeong (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Chang, Chaewon (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Kim, Kyunghyun (Water Quality Assessment Research Division, National Institute of Environmental Research) ;
  • Han, Young-Un (Yeongsan-River Environment Research Center, National Institute of Environmental Research) ;
  • Kang, Taegu (Yeongsan-River Environment Research Center, National Institute of Environmental Research)
  • 김지유 (국립환경과학원 물환경평가연구과) ;
  • 강태우 (국립환경과학원 영산강물환경연구소) ;
  • 홍정기 (국립환경과학원 물환경평가연구과) ;
  • 안미정 (국립환경과학원 물환경평가연구과) ;
  • 장채원 (국립환경과학원 물환경평가연구과) ;
  • 김경현 (국립환경과학원 물환경평가연구과) ;
  • 한영운 (국립환경과학원 영산강물환경연구소) ;
  • 강태구 (국립환경과학원 영산강물환경연구소)
  • Received : 2016.09.05
  • Accepted : 2016.12.14
  • Published : 2016.12.25
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Abstract

$^{137}Cs$ was investigated in river bottom sediments located in South-Han River basin and it was compared with international case studies to estimate the concentration level of $^{137}Cs$ in river sediment of Korea. The obtained values of $^{137}Cs$ which was analyzed by gamma-ray spectrometry were in the range of <$MDA{\sim}3.80{\pm}0.14Bq/kg{\cdot}dry$ and similar to the $^{137}Cs$ activities in soil of Korea. According to international case studies, $^{137}Cs$ activities were between 3.7 to $15,396Bq/kg{\cdot}dry$, when pollutants such as nuclear power plant accidents and radiation leaks were present near the rivers. The $^{137}Cs$ activities showed a variety of distribution depending on the country, when pollution occurs and survey time. Also, $^{137}Cs$ activities of river sediments without pollution sources were mostly less than $10Bq/kg{\cdot}dry$ in other countries. It was comparable with the obtained $^{137}Cs$ activities in this study. The obtained values provide useful information on the background concentration of $^{137}Cs$ in river sediment and will be able to use a basis for determining contamination of $^{137}Cs$ in the river.

본 연구는 남한강 수계 하천 퇴적물 중 $^{137}Cs$의 방사능 농도 분포 실태를 조사하고, 국외 연구사례와 비교하여 국내 하천퇴적물 중 $^{137}Cs$의 농도수준을 평가하였다. 감마선분광분석기를 이용하여 퇴적물 중 $^{137}Cs$의 방사능 농도를 분석한 결과, 농도범위는 <$MDA{\sim}3.80{\pm}0.14Bq/kg{\cdot}dry$로 국내 토양 중 $^{137}Cs$ 농도와 비슷한 수준을 보였다. 국외 연구사례를 조사한 결과, 원전사고나 방사성물질 유출 등에 의한 오염원이 존재할 경우 $^{137}Cs$의 농도범위는 $3.7{\sim}15,396Bq/kg{\cdot}dry$로 국가별, 오염원 발생시기, 조사시점 등에 따라 다양한 농도 분포를 보였다. 또한, 오염원이 없는 국외 하천 호소 퇴적물 중 $^{137}Cs$의 농도는 대부분 $10Bq/kg{\cdot}dry$ 미만으로 본 연구결과와 유사한 수준으로 나타났다. 본 연구결과는 우리나라 하천퇴적물 중 $^{137}Cs$의 배경농도를 제공하고, 하천의 $^{137}Cs$ 오염여부를 판단하는 기초자료로 활용할 수 있을 것으로 사료된다.

Keywords

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