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이택중(T. J. Lee),정명상(M. S. Jeong),김흥락(H. R. Kim),박혜숙(H. S. Park) 한국환경관리학회 2010 環境管理學會誌 Vol.16 No.1
For studying on concentration distribution and characteristic of radon for public facilities, we analyzed radon from 13 hospitals, 8 large stores, 8 fomentation rooms, 5 nurseries, 5 indoor parking lots, 2 postpartum clinics, 1 underground shopping center from January to December in Cheonan area. The results were as follow 1. Indoor average radon concentrations investigated were 0.73 pCi/L in underground shopping center. That value was highest one. and other average radon concentrations were 0.42 pCi/L in fomentation room, 0.34 pCi/L indoor parking lot, 0.32 pCi/L in nursery, 0.28 pCi/L in large store and postpartum clinic, 0.25 in hospital. Indoor average radon concentration of public facilities were 0.37 pCi/L, it was lower than 4.0 pCi/L of recommended criterion. 2. Investigating the distribution of concentration in underground facilities and above ground, the average radon concentration in underground facilities was 0.38 pCi/L that was higher than 0.17 pCi/L in above ground. The ratio of underground concentration to above ground in hospital was 1.0, so there was no significant difference between underground and above ground. But there was significant difference between indoor parking lot and large store as 4.0 and 2.8. 3. Investigating the time variation with radon concentration for a day, average radon concentration for a day in large store and hospital were 0.28 pCi/L, 0.63 pCi/L respectively. The difference with radon concentration for a day was 0.7 pCi/L in large store and 1.10 pCi/L in hospital. in Respect of ventilation system, The average concentration in large shopping center was 0.18 pCi/L with ventilation working, 0.38 pCi/L without ventilation working and in hospital 0.53 pCi/L, 0.72 pCi/L. This showed that radon concentration accumulated in a hermetic chamber without ventilation were high. There fore the ventilation was considered as a main means of indoor radon reduction. 4. When anticipating each facility worker"s annual effective dose by the inhalation in public facilities that the mean concentration was 0.37 pCi/L, annual effective dose was 13.54 mRem/yr. And underground shopping center has the highest value as 26.71 mRem/yr. This is much lower than 130 mRem/yr(1.3 mSv/yr) which is worldwide annual effect dose by The inhalation of radon and Its daughter announced in International Commission on Radiological Protection(ICRP). In conclusion, The Radon average concentration public facilities in Cheonan was lower than that of recommended indoor criterion and annual effective dose was lower than that of ICRP, But considering a main cause of lung cancer and increase of living in indoors and an area with much Radon in soil, The investigation of regional Radon condition, research on health effect of Radon, the measure of Radon reduction must be needed to carry out.
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