Measurement of Cs-137 in Ice Core Samples from Antarctica
- 주제(키워드) Antarctica , Environmental radiation , Artificial radioisotopes , HPGe detector
- 주제(기타) Physics, Multidisciplinary
- 설명문(일반) [Lim, S. I.; Kim, D. H.; Hahn, I. S.] Ewha Womans Univ, Dept Phys, Seoul 03766, South Korea; [Huh, J. Y.; Lee, J.; Hahn, I. S.] Ewha Womans Univ, Dept Sci Educ, Seoul 03766, South Korea; [Han, Y. C.; Hur, S. D.; Hwang, H. J.] Korea Polar Res Inst, Div Polar Paleoenvironm, Incheon 21990, South Korea; [Kang, W. G.; Kim, Y. D.; Lee, E. K.; Lee, M. H.] Inst for Basic Sci Korea, Ctr Underground Phys, Daejeon 34047, South Korea
- 발행기관 KOREAN PHYSICAL SOC
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000160315
- 본문언어 영어
- Published As http://dx.doi.org/10.3938/jkps.73.1263
초록/요약
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 Cs-137 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 +/- 0.03 years, Cs-137 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 similar to 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 Cs-137 in the H25 sample to be 0.98 +/- 0.82 mBq/kg. Although the activity has a large uncertainty mainly due to the limited sample quantity, the Cs-137 isotopes in the Antarctic ice core were measured for the first time in Korea.
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