Journal of the Korean Physical Society

  • 제73권9호
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  • Pages.1263-1268
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  • 2018
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  • 0374-4884(pISSN)
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  • 1976-8524(eISSN)
한국물리학회 (Korean Physical Society)
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Measurement of 137Cs in Ice Core Samples from Antarctica

  • Lim, S.I. (Department of Physics, Ewha Womans University) ;
  • Kim, D.H. (Department of Physics, Ewha Womans University) ;
  • Huh, J.Y. (Department of Science Education, Ewha Womans University) ;
  • Lee, J. (Department of Science Education, Ewha Womans University) ;
  • Hahn, I.S. (Department of Physics, Ewha Womans University) ;
  • Han, Y.C. (Division of Polar Paleoenvironment, Korea Polar Research Institute) ;
  • Hur, S.D. (Division of Polar Paleoenvironment, Korea Polar Research Institute) ;
  • Hwang, H.J. (Division of Polar Paleoenvironment, Korea Polar Research Institute) ;
  • Kang, W.G. (Center for Underground Physics, Institute for Basic Science) ;
  • Kim, Y.D. (Center for Underground Physics, Institute for Basic Science) ;
  • Lee, E.K. (Center for Underground Physics, Institute for Basic Science) ;
  • Lee, M.H. (Center for Underground Physics, Institute for Basic Science)
  • 투고 : 2018.05.08
  • 심사 : 2018.07.05
  • 발행 : 2018.11.15
⟨ 이전 논문 다음 논문 ⟩

초록

Three different ice core samples from Antarctica were analyzed to identify activity concentrations of radioactive isotopes. Tracking migration of radioactive isotopes to Antarctica can provide a key clue to understand global environmental changes caused by radiation exposures because the Antarctic ice cores can preserve unique characteristics of various environmental conditions. We are particularly interested in the $^{137}Cs$ nucleus, because it is closely related to radiation exposure from nuclear power plant accidents and nuclear bomb tests. With its half life of $30.17{\pm}0.03$ years, $^{137}Cs$ can also be used to assess the age of sedimentation occurring after around the year 1945. We selected three ice core samples, called Tarn8, Styx27, and H25, from different time periods; the Tarn8 sample is known to be from earlier than ~ 1000 AD, the Styx27 sample is approximately from the year 1945, and the H25 sample is from the year 2012. Radioactive isotope measurements of the ice core samples were performed using a 100% HPGe detector at Cheongpyeong Underground Radiation Laboratory (CURL). We measured the activity of $^{137}Cs$ in the H25 sample to be $0.98{\pm}0.82mBq/kg$. Although the activity has a large uncertainty mainly due to the limited sample quantity, the $^{137}Cs$ isotopes in the Antarctic ice core were measured for the first time in Korea.

키워드

과제정보

연구 과제 주관 기관 : Korea Polar Research Institute (KOPRI), National Research Foundation of Korea (NRF)

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피인용 문헌

  1. Measurements of the Specific Activities of 137Cs in Antarctica Environmental Samples by Using the Low-Level Radiation Analysis Method vol.77, pp.3, 2020, https://doi.org/10.3938/jkps.77.217