1. Elemental Technological R&D Center, NTN Corporation, 5-105, Hidamarinooka, Kuwana-shi, Mie 511-0867, JP (Corresponding author), e-mail: takumi_fujita@ntn.co.jp
2. Advanced Technology R&D Center, NTN Corporation, 5-105, Hidamarinooka, Kuwana-shi, Mie 511-0867, JP.
3. X-Ray Applications Equipment Section, Engineering Department, Pulstec Industrial Co., Ltd., 7000-35 Nakagawa, Hosoe-cho, Kita-ku, Hamamatsu-city, Shizuoka 431-1304, JP.
4. School of Humanities, College of Human and Social Science, Kanazawa University, kakuma-machi, Kanazawa-shi, Ishikawa 920-1190, JP.