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- 저자 : 이택중(T.J.Lee) (검색결과 2 건)
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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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황토, 갯벌 및 머드의 중금속 흡착율에 관한 실험적 연구
이인숙(l.S.Lee),이미영(M.Y.Lee),이택중(T.J.Lee),김현정(H.J.Kim),이병창(B.C.Lee),정명상(M.S.Jeong),방은옥(E.O.Bang),송현실(H.S.Song),황혜경(H.K.Hwang),이중호(J.H.Lee),조영채(Y.C.Cho) 대한환경위생공학회 2004 대한환경위생공학회지 Vol.19 No.2
Yellow loess, Tidal plat sediment, and mud are known to be high in adsorption though they have great distinction according to the ratio of clay minerals content and their kinds. Thus one of the samples for this study can be obtained by drying of Yellow loess, Tidal plat sediment, and the mud which is semifinished products that are from the progress of heat treatment and making homogeneity which can be found everywhere in our country. Another sample can be prepared by reducing pollutants with the adsorbent and by burning heavy metals of their own. With the samples, noxious heavy metals such as Pb, Cd, and essential trace elements such as Cu, Fe, Mn by each concentration is tested for adsorption according to pH, the kinds of adsorbents and the amount of injection. With the help of these steps, this study shows that the adsorbents, which are green, reducing the additional pollution and low in price, can be found. It also shows that the optimal condition for removing pollutants can be found and the basic materials for treating water can be offered. The results were as follows;<br/> Yellow loess shows the rates of adsorption by more than 50% and Tidal plat sediment and Mud show it by more than 90%. Thus Tidal plat sediment and Mud are higher than Yellow loess the rates of adsorption.<br/> The pH should be treated in natural condition because the rates of adsorption of Pb, Cd, Cu, Mn excepting Fe in mud is higher in pH 7 than in pH 3 of Yellow loess, Tidal plat sediment, and Mud.<br/> The drying adsorbents are good to use because the rates of adsorption of heavy metals has tendency to be higher in the drying method than in the burning method.<br/> It is considered that the more the amount of the injection of the adsorbent is , the higher the rates of adsorption is, and one gram is reasonable for the amount of the injection of Tidal plat sediment and mud.<br/> Yellow loess is suitable for the treatment of the water that includes low concentration of heavy metals because it has the lower rate of adsorption as the concentration of noxious heavy metals is higher.<br/> It is thought that Tidal plat sediment and Mud is proper for the treatment of the water that includes high concentration of heavy metals because the rates of adsorption has not been changed as the concentration of heavy metals increases.
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