*Theeraporn Chuenpee¹、Osamu Nishikawa⁵、Yoshiaki Kon⁴、Kiyotaka Ninagawa³、Shin Toyoda³、Takeyuki Ogata⁵、Takashi Uchida⁵、Isao Takashima² (1.Faculty of Engineering and Resource Science, Akita University、2.Mining Museum, Akita University、3.Department of Applied Physics, Okayama University of Science、4.National Institute of Advanced Industrial Science and Technology、5.Faculty of International Resource Sciences, Akita University)