Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Prediction for the Lifetime Effective Dose and Radon Exposure Risk by using Dose Conversion Convention: Base on the Indoor Radon Concentration of Lecture Room in a University

선량 환산 관례를 이용한 생애유효선량 및 라돈피폭 위험도 예측: 대학 강의실 라돈농도 중심으로

  • Lee, Jae-Seung (Research Institute of R&D Center, Segei Inspection Engineering Technology Co., Ltd.) ;
  • Kweon, Dae Cheol (Department of Radiological Scienece, College of Bioecological Health, Shinhan University)
  • 이재승 (세계아이티(주) 기업부설연구소) ;
  • 권대철 (신한대학교 바이오생태보건대학 방사선학과)
  • Received : 2018.07.25
  • Accepted : 2018.11.28
  • Published : 2018.12.31
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Abstract

The indoor radon concentration was measured in the lecture room of the university and the radon concentration was converted to the amount related to the radon exposure using the dose conversion convention and compared with the reference levels for the radon concentration control. The effect of indoor radon inhalation was evaluated by estimating the life effective dose and the risk of exposure. To measure the radon concentration, measurements were made with a radon meter and a dedicated analysis Capture Ver. 5.5 program in a university lecture room from January to February 2018. The radon concentration measurement was carried out for 5 consecutive hours for 24 hours after keeping the airtight condition for 12 hours before the measurement. Radon exposure risk was calculated using the radon dose and dose conversion factor. Indoor radon concentration, radon exposure risk, and annual effective dose were found within the 95% confidence interval as the minimum and maximum boundary ranges. The radon concentration in the lecture room was $43.1-79.1Bq/m^3$, and the maximum boundary range within the 95% confidence interval was $77.7Bq/m^3$. The annual effective dose was estimated to be 0.20-0.36 mSv/y (mean 0.28 mSv/y). The life-time effective dose was estimated to be 0.66-1.18 mSv (mean $0.93{\pm}0.08mSv$). Life effective doses were estimated to be 0.88-0.99 mSv and radon exposure risk was estimated to be 12.4 out of 10.9 per 100,000. Radon concentration was measured, dose effective dose was evaluated using dose conversion convention, and degree of health hazard by indoor radon exposure was evaluated by predicting radon exposure risk using nominal hazard coefficient. It was concluded that indoor living environment could be applied to other specific exposure situations.

Keywords

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그림 1. 권장 실내 라돈 농도 (a)와 연간 유효선량 (b)의 비교 결과. Fig. 1. Comparison results of the recommended indoor radon concentration levels (a) and the recommended annual effective doses (b).

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그림 2. 실내 라돈 농도의 전체 확률 무작위 분포에 따른 생애유효선량 및 라돈 노출 위험에 대한 예상 결과. Fig. 2. Predicted results for the lifetime effective dose and radon exposure risk according to the overall probability random distribution of indoor radon concentration.

표 1. 국제방사선방호위원회(ICRP)가 권장하는 환산계수의 요약 Table 1. Summary of conversion coefficients recommended by International Commission on Radiological Protection (ICRP)

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표 2. 동일 실내 강의실을 24시간 측정한 실내 라돈농도 및 연간유효선량의 결과 Table 2. Results for indoor radon concentrations and annual effective doses by measured the same lecture room for 24 hours

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표 3. 4년간 대학 교육 일정 중에 실내 라돈 농도를 흡입에 의한 생애유효선량 및 라돈 노출 위험 예상의 결과 Table 3. Predicted results for the lifetime effective dose and radon exposure risk by inhalation of indoor radon concentration during the university’s schooling schedule of four years

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