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大田市 新地下商街에서의 라돈(Rn-222)濃度 測定 및 年間 被爆線量 豫測
서지미,김윤신 漢陽大學校 環境 및 産業醫學硏究所 1995 環境과 産業醫學 Vol.4 No.1
Average radon concentrations have been measured at the new shopping arcade (constructed on Sep. 28, 1992) located in Eun-haeng Dong, Taejon city. The annual radiation dosage of the radon nuclide to which workers in the basement shopping area can be exposed has been estimated based on the measured average radon concentration values. The Rad track etching monitor manufactured by Landauer Co. in the United States, was used as the measuring instrument, and in order to verify the reproducibility values of the monitor, the radiation monitoring period was divided into the 1st and the 2nd phase with regard to the areas to be measured. The average radon concentration value measured by the first connected monitor(duration : approximately 9 weeks, from Jan. 12, 1994 to Mar. 13, 1993) was 0.69 pCi/L, whilst the value measured by the second connected monitor (duration : approximately 6 weeks, from Feb. 1, 1994 to Mar. 13, 1994) showed 0.70 pCi/L, indicating a considerably high degree of reproducibility. The new Underground shopping arcade located in Taejon city was divided into 4 areas for the purpose of measuring radon concentration values. The results of the survey have shown average radon concentration values to be 0.68 pCi/L for area A: 0.68 pCi/L for area B: 0.78pCi/L for area c, and 0.93 pCi/L for area D: whilst the average radon concentration for the entire shopping arcade was reckoned at 0.74 pCi/L, avalue considerably less than 1/5 of the maximum acceptable values 4 pCi/L, Ministry of Environment of Korea. The annual radiation dosage that persons working in the Underground shopping arcade can be exposed to during working hours was estimated at 37.3572 mRem. This radiation dose is significantly lower than 130 mRem maximum radiation dosage from the radon nuclide prescribed by the International Radiation Protection Committee, with respect to the overall working hour exposure of the average adult.