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주한영,김재욱,문주현 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.10
In this research, we developed and characterized a phoswich radiation sensor (PHORS) to simultaneously measure the count rates and the energies of beta and gamma radiation. The proposed PHORS device comprises a sensing probe combining NaI(Tl) and CaF2(Eu) scintillators for simultaneous measurement of beta and gamma radiation, a multichannel analyzer to characterize the radiation energy, and a laptop computer for signal analysis. For its performance test, we employed a prototype PHORS to measure the energies and the count rates of beta and gamma radiation from three different radiation sources for separation distances from 2 to 10 cm. The count rates of the PHORS were consistent with expected rates, and the captured energy spectra showed classic radionuclide characteristics. Thus, the proposed PHORS system provides an effective and facile tool to detect beta and gamma radiation simultaneously and to identify radionuclides from the captured energy spectra.
주한영,김재욱,정소윤,최진식,문주현 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.9
Our study adopted a big data analysis approach to determine whether there was a significant relationship between environmental radiation dose rates or age and cancer incidence rates in the Republic of Korea. The data for this analysis included environmental radiation dose rates, number of cancer patients, and age distributions of the residents from 2009 to 2016 in the administrative districts where environmental radiation monitoring posts were located. For this analysis, the environmental radiation dose rates were obtained from 171 monitoring posts located in 113 elementary administrative districts in the Republic of Korea. The number of cancer patients and the age distributions were obtained from the Central Cancer Information Center of the National Cancer Center of Korea and the Ministry of the Interior and Safety, respectively. Our findings indicated that there was no statistically significant relationship between the environmental radiation dose rate and the cancer incidence rate. However, age had a considerable influence on the cancer incidence rate of the monitored regions.
주한영,김재욱,문주현 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
In this study, we investigated whether there is a significant relationship between the natural radiation dose rate and the cancer incidences in Korea by using a big data analysis. The natural dose rate data for this analysis were the measurement data obtained from the 171 monitoring posts of the 113 administrative districts in Korea over the 10 years from 2007 to 2016. The relative cancer incidences for this analysis were the difference in the cancer patients per hundred thousand people year-on-year in the administrative districts with the five highest and the five lowest natural gamma dose rates each year over the same period. To analyze the correlation between the two variables, Spearman's rank correlation coefficient between the two rates was derived using R, a well-known big data analysis tool. The analysis showed that Spearman's rank correlation coefficient was more than 0.05 and that the correlation between the two variables was not statistically significant
주한영,김재욱,정소윤,김영서,문주현 한국원자력학회 2021 Nuclear Engineering and Technology Vol.53 No.12
In this study, the relationship between the environmental radiation dose rate and meteorological variables was investigated with multiple regression analysis and big data of those variables. The environmental radiation dose rate and 36 different meteorological variables were measured on Ulleung Island,Republic of Korea, from 2011 to 2015. Not all meteorological variables were used in the regressionanalysis because the different meteorological variables significantly affect the environmental radiationdose rate during different periods, and the degree of influence changes with time. By applying thePearson correlation analysis and stepwise selection methods to the big dataset, the major meteorologicalvariables influencing the environmental radiation dose rate were identified, which were then used as theindependent variables for the regression model. Subsequently, multiple regression models for themonthly datasets and dataset of the entire period were developed
김재욱,주한영,김린아,문주현 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.3
This article measured and analyzed the indoor radon concentrations at one university building inGyeongju, Republic of Korea, to investigate if there is any relationship between earthquakes and indoorradon concentration. Since 12 September 2016, when two 5.1 and 5.8 magnitude earthquakes occurred,hundreds of aftershocks affected Gyeongju until January 2017. The measurements were made at theground floor of the Energy Engineering Hall of Dongguk University in Gyeongju over a period betweenFebruary 2016 and January 2017. The measurements were made with an RAD7 detector on the basis ofthe US Environmental Protection Agency measurement protocol. Each measurement was continuouslymade every 30 minutes over the measurement period every month. Among earthquakes with 2.0 orgreater magnitude, the earthquakes whose occurrence timings fell into the measurement periods werescreened for further analysis. We observed similar spike-like patterns between the indoor radon concentrationdistributions and earthquakes: a sudden increase in the peak indoor radon concentration 1e4days before an earthquake, gradual decrease before the earthquake, and sudden drop on the day of theearthquake if the interval between successive earthquakes was moderately longer, for example, 3 days inthis article.
최진식,김재욱,주한영,이정연,이채현,문주현 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
After a nuclear power plant (NPP) accident, it would be helpful to predict the movement of the radioactive plume emitted from the NPP as accurately as possible to protect the nearby population. Radioactive plumes are mainly affected by wind direction and speed. Since it is difficult to identify the wind direction and speed immediately after the accident, a good understanding of the historical wind data could save many lives and ensure smoother evacuation procedures. In this study, wind data for the past 10 years are analyzed for the five NPPs in the Republic of Korea (ROK). The analyzed data include wind direction and wind speed from 2012 to 2021. In particular, the characteristics of the wind field blowing from the NPPs to the nearest densely populated regions are examined. Finally, suggestions to improve evacuation plans are made.
최진식,김재욱,주한영,문주현 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1
During a nuclear power plant (NPP) accident, radioactive material may be released into the surrounding environment in the form of a radioactive plume. The behavior of the radioactive plume is influenced by meteorological factors such as wind direction and speed. If the residents are evacuated to a shelter in the direction of the flow of the radioactive plume, the radiation exposure of the residents may increase, contrary to the purpose of the evacuation. To avoid such an undesirable outcome, this paper applies a big data analysis to evaluate the suitability of the shelter locations near 5 NPPs in the Republic of Korea in terms of the seasonal wind direction frequency in those areas. To this end, the wind data measured around the NPPs from 2016 to 2020 were analyzed to derive the seasonal wind direction frequency using a big data analysis. These analyses results were then used to determine how many shelters around NPPs locate in areas with prevailing wind direction per season. Then, suggestions were made on the direction for residents not to evacuate, if possible, that is, the prevailing seasonal wind directions for 5 NPPs, depending on the season in which the accident occurs.
원자력 시설 주변 방사선량 감시를 위한 양방향 이동형 방사선측정 시스템 개발
이홍연,김보길,주한영,김재욱,최진식,문주현 (사)한국방사선산업학회 2022 방사선산업학회지 Vol.16 No.4
To protect local residents and environment from radioactive material that might be releasedfrom nuclear energy facilities, regulatory agencies, nuclear operator, and local governments havechecked the radioactivity concentration and radiation dose rate and analyzed the samples taken in theenvironment neighboring them, according to the Nuclear Safety and Security Commission Notice No. 2019-10 (Standards for Radiation Protection, etc.). This study aims to develop a mobile environmentalradiation monitoring system that could be installed on public transportation vehicles, for the successfuldevelopment. A mobile two-way radiation measurement system was developed, and performanceevaluation was performed by installing a system on public transportation in the area around the nuclearpower plant to perform performance evaluation. As a result of the performance evaluation, it wasconfirmed that the mobile two-way radiation detection system worked properly.