• Journal of the Korean Society of Radiology
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• v.18 no.6
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• pp.613-620
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• 2024

This study aims to measure the level of indoor radon concentration in classrooms where college students take lectures and participate in activities, and use it as basic data for indoor radon management measures in school classrooms. To measure radon concentration, the study was conducted in a classroom at a university located in Gyeonggi-do, depending on the university classroom operating environment. Radon was measured using the RadoMon Kit (Betterlife Co., Ltd., Suwon, Korea). To measure radon concentration, the effective dose model presented in the United Nations Scientific Committee on the Effects of Radiation Effects Report 2000 (UNSCEAR (2000) was used. The effective dose was evaluated by applying a total of 1,200 hours of annual living time indoors in the classroom. The radon concentration in the classroom and laboratory was measured, the annual effective dose was evaluated, and the effective dose was converted by entering the radon concentration and factors using the personal radon dosimetry program provided by WISE. The radon concentration using the charcoal canister was 80.29 Bq/m³ in the classroom, and 90.28 Bq/m³ in the laboratory, indicating a high radon concentration in the laboratory. The annual effective dose and cumulative dose of radon concentration were measured at 1.21 mSv in the classroom and 1.36 mSv in the laboratory, and the dose rate was 1.008 µSv/h in the classroom and 1.134 µSv/h in the laboratory. The indoor radon concentration was measured at a level lower than the indoor radon concentration management standard, but from the viewpoint of optimization of protection, efforts should be made to keep the radon concentration as low as reasonably achievable and reduce the degree of health hazard, and continuous management is necessary.

• Journal of Radiation Protection and Research
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• v.20 no.1
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• pp.16-24
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• 1995

Assesment of dose equivalent given by inhaled $^{222}Rn$ and its progeny has been carried out based on the concentrations of $^{222}Rn$ and its daughters in indoor air, and equilibrium factor between them measured by charcoal canister method and alpha spectrometry. Assuming the occupancy factor to be 0.8, and breathing rate to be $0.75m^3\;h^{-1}$ for public and $1.2m^3\;h^{-1}$ for occupational exposure, respectively, the regional lung dose 대valent and the resulting annual effective dose equivalent due to the inhalation of $^{222}Rn$ and its daughters in indoor air were evaluated by use of three different lung models, namely, Jacobi-Eisfeld, James-Birchall and ICRP model.