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충남대 잔디밭 토양 중 <sup>40</sup>K과 <sup>137</sup>Cs의 방사능 농도 및 경년 변화
김진아 ( Jina Kim ),노형아 ( Hyungah Noh ),홍기민 ( Kimin Hong ) 충남대학교 기초과학연구원 2022 충남과학연구지 Vol.39 No.1
The radioactivity levels of <sup>40</sup>K(Potasium) and <sup>137</sup>Cs(Caesium) in the soil in Chungnam National University were measured using a high-growth ray spectrometry system consisting of a detector (HPGe, High Purity Germanium) and a multi-wave analyzer. The radioactivity level of <sup>40</sup>K in the topsoil in the second half of 2022 in Chungnam National University(CNU), was 863 Bq/kg-dry and the radioactivity level of <sup>137</sup>CS was lower than the minimum detectable activity(MDA). The radioactivity level of <sup>40</sup>K in the subsoil was 882 Bq/kg-dry, and the radioactivity level of <sup>137</sup>Cs was not detected. This is a value that does not deviate from the direction of secular change in radiation levels.