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Choi, Hoon,Park, Byeongryong,Choi, Muhyun,Lee, Byungil,Lee, Cheol Eui Nuclear Technology Publishing 2014 Radiation Protection Dosimeetry Vol.159 No.1
<P>An alternative method for fingernail/electron paramagnetic resonance (EPR) dosimetry valid at low doses (0–3 Gy) is suggested in this paper. The method consisted of two steps. The first step involved dehydrating fingernail clippings to remove their water content by heating them at 70 °C for 72 h. As the water content in the fingernails decreased, the variability of the EPR signals improved. The second step involved measuring and fitting the EPR signals at successive microwave power levels. A newly derived value known as ‘curvature’, which was based on the conventional peak-to-peak amplitudes of the EPR signals, was applied for the dosimetry. This method could be used as an alternative method in cases of low-radiation exposure doses (<3 Gy) or where use of the conventional dosimetry method is not proper for a fingernail sample.</P>
PRELIMINARY STUDY OF WATER CONTENTS AND SIGNAL BEHAVIOR IN FINGERNAIL/EPR DOSIMETRY
Choi, Hoon,Choi, Sul A,Lee, Byungil The Korean Association for Radiation Protection 2013 방사선방어학회지 Vol.38 No.4
Heating method using electric heater was used to reduce water content in fingernail clippings. Authors found that low water content is helpful to measure EPR signal of fingernail sample with enhanced variability. Generally, natural dehydration happens in normal room condition at least one month and needs much time for using in experiment. So, artificial heating method is applied in this study for time savings. Fingernail samples were tested to find effect of water content to the EPR signal on microwave power levels for dosimetry. Low water content in fingernail reduced variability of EPR signal and makes it possible to measure accurate EPR signal. It also made it possible to measure constant movement of EPR signals on several microwave power levels. Although this method was difficult to apply directly in fingernail/EPR dosimetry, we, authors, believe that this heating method would be useful to differentiate MIS2 and RIS which are generally located at the same g-factor and almost impossible to be identified with each other.
최병일(Byungil Choi),김명배(Myungbae Kim),한용식(Yongshik Han),정경열(Kyungyul Chung),박창대(Changdae Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Plant availability and safety are affected by the risk of the plant strongly. To reduce the risk, the efforts in every life cycle (plant design, plant equipment procurement and plant operation) of the plant industry are needed. In this paper, we introduce ICT convergence technologies which are carried out in dept. of the energy plant safety technology in KIMM, especially smart plant equipment, plant inspection/maintenance and safety action.
최병일 ( Choi Byungil ),김재홍 ( Kim Jae Hong ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
This research provide a general model for viscosity curve. The rheological behavior of cement-based materials has been described by a flow curve. The flow curve helps intuitive understanding to explaining the flow of concrete. However, in this study, the rheological behavior of cement paste was analyzed using different approach called the viscosity curve. In this study, Sisko model for viscosity curve is used to indicate the rheological behavior of cement paste. Also relaxation process is analyzed by exponential model.