Performance Evaluation of Several Radon Detectors in the Standard Chamber and Dwellings

라돈 표준실과 가옥 내에서 일부 라돈검출기에 대한 성능 평가

  • Yoon, Seok-Won (Department of Measurement and Detection of Radiation, University of Science and Technology) ;
  • Kim, Yong-Jae (Department of Measurement and Detection of Radiation, University of Science and Technology) ;
  • Chang, Byung-Uck (Department of Measurement and Detection of Radiation, University of Science and Technology) ;
  • Byun, Jong-In (Department of Measurement and Detection of Radiation, University of Science and Technology) ;
  • Yun, Ju-Yong (Department of Measurement and Detection of Radiation, University of Science and Technology)
  • 윤석원 (과학기술연합대학원대학교) ;
  • 김용재 (과학기술연합대학원대학교) ;
  • 장병욱 (과학기술연합대학원대학교) ;
  • 변종인 (과학기술연합대학원대학교) ;
  • 윤주용 (과학기술연합대학원대학교)
  • Published : 2008.12.30

Abstract

To ensure the performance of radon detectors, three passive radon detectors ($RadTrak^{(R)}$, $Radopot^{(R)}$, and $E-PERM^{(R)}$)have been reviewed. The difference ratios of RadTrak and Radopot tested in the radon standard chamber were -13.2% and -6.0%, respectively, which were in good accordance within 20% of the value measured by $AlphaGUARD^{(R)}$. To ensure the performance of the long term measurement, the 3 detectors were installed at the same position of approximately one hundred of dwellings for one year. The correlation curve between RadTrak and Radopot shows good agreement with a correlation coefficient ($R^2$) of 0.91. However, The correlation curve between E-PERM and Radopot shows bad agreement ($R^2$ = 0.021). In addition, the distribution map of annual mean indoor gamma dose rate measured with E-PERM was not in accordance with the distribution map of outdoor gamma dose rate measured by Portable Ion Chamber. According to the results, some requisites for the selection of the radon passive detectors in the large-scale indoor radon survey were discussed.

References

  1. ICRP. Recommendations of the International Commission on Radiological Protection. Report No. 60. Annuals of the ICRP. UK:Pergamon Press
  2. 한국원자력안전기술원. 전국환경방사능조사. 과학기술부. 2007
  3. Panasonic Inc. TL Badge Technical Data. Matsushita Electric Industrial Co., LTD. 1985
  4. Zhuo W, Tokonami S. A simple passive monitor for integrating measurements of indoor thoron concentrations. Review of Scientific Inst. 2002;73(8)
  5. Dorschel B, Pretzsch G. Optimization of Electret Ionization Chamber for Dosimetry in Mixed Neutron-Gamma Radiation Fields. Radiation Protection Dosimetry. 1984;9:43-47
  6. Vargas A, Ortega X. Influence of Environmental Changes on Integrating Radon Detectors: Results of an Intercomparison Exercise. Radiation Protection Dosimetry. 2007;123(4):529-536 https://doi.org/10.1093/rpd/ncl161
  7. Kotrappa, P, Dempsey JC, Ramsey RW, Stieff LR. A practical $E-PERM^{(R)}$ (Electret passive environmental radon monitor) system for indoor $^{222}Rn$ measurement. Health Physics. 1990;58(4):461-467 https://doi.org/10.1097/00004032-199004000-00008
  8. 한국원자력안전기술원. 전국 실내 라돈 농도 및 공간감마선량률 준위 조사. 과학기술부. 2005
  9. Sessler GM. Electrets: recent developments. Journal of Electrostatics. 2001;51-52:137-145 https://doi.org/10.1016/S0304-3886(01)00091-2
  10. U.N. Scientific Committee on the Effects of Atomic Radiation. UNSCEAR Report 2000. New York. United Nations. 2000
  11. Usman.S, Spitz H. Analysis of electret analysis ion chamber radon detector response to $^{222}Rn$ and interference from background gamma radiation. Health Physics. 1999;76(1):44-49 https://doi.org/10.1097/00004032-199901000-00007
  12. Durrani SA. Radon Measurement by Etched Track Detectors. World Scientific Press. 1997
  13. Nikezic D, Yu KN. Formation and growth of tracks in nuclear track materials. Materials Science and Engineering. 2004. Report vol.46(3-5):51-123 https://doi.org/10.1016/j.mser.2004.07.003
  14. Chen1 J, Tokonami S. Preliminary Results of Simultaneous Radon and Thoron Tests in Ottawa. Radiation Protection Dosimetry. 2008;1-4
  15. 김창규, 김용재. 서울, 인천, 경기지역 가옥내 라돈, 토론 및 토론자핵종 농도분포 및 연평균 유효선량 평가. '03추계방사선 방어학회 초록집. 2003
  16. 라돈실태조사 지침 수립 연구. 환경부. 2007
  17. 한국원자력안전기술원. 국민 방사선 위해도 평가. 과학기술부. 2005
  18. Howarth CB. Results of the 2004 NRPB Intercomparison of Passive Radon Detectors. NRPB. U.K. 2004