1. Radioactive Material Chemical Analysis Section, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
2. Inorganic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea
3. Department of Science Education, Chemistry Major, and Institute of Fusion Science, Jeonbuk National University, Jeonju 54896, Republic of Korea