This study was carried out considering that activated carbon physically adsorbs radon. Among the air cleaners equipped with activated carbon filter, eight air cleaners sold in Korea were selected and the radon reduction rate experiment was conducted. The instrument used an ionization chamber type instrument with a sensitivity of 3 CPM. The experiment was carried out by excluding the natural rate of reduction of radon in order to accurately grasp the radon reduction rate of activated carbon filter. Of the eight air purifiers, only three showed a reduction rate of more than 30%, while the remaining five air purifiers showed a reduction rate of less than 20%. This does not seem to be much different from the natural reduction rate. In addition, since it is not adsorbed by radon alone due to the nature of activated carbon, it is expected that the reduction rate will be lower in a real life environment.

1. 서 론
 2. 실험방법
  2.1 실험용 공기청정기 수집
  2.2 실험 조건
 3. 결과 및 고찰
  3.1 필터 구조 및 자연저감률
  3.2 공기청정기별 챔버 내 라돈농도 변화
  3.3 필터 저감률
 4. 결 론
 References

• 차동욱(연세대학교 환경공학과, 연세대학교 자연방사능 환경보건센터, Department of Environmental Engineering, Yonsei University, Yonsei University Natural Radioactivity Environmental Health Center, The Ministry of Environment) | Dong Wook C
• 김선홍(연세대학교 환경공학과, 연세대학교 자연방사능 환경보건센터, Department of Environmental Engineering, Yonsei University, Yonsei University Natural Radioactivity Environmental Health Center, The Ministry of Environment) | Seon Hong Kim
• 조승연(연세대학교 환경공학과, 연세대학교 자연방사능 환경보건센터, Department of Environmental Engineering, Yonsei University, Yonsei University Natural Radioactivity Environmental Health Center, The Ministry of Environment) | Seung Yeon Cho Corresponding author