Makhsun Makhsun
Institute of Applied Beam Science, Ibaraki University Mito 310-8512, Ibaraki, Japan Center for Technology of Radiation Safety and Metrology, Indonesian National Nuclear Energy Agency Jakarta Selatan 12070, Indonesia

T. Sakuma
Institute of Applied Beam Science, Ibaraki University Mito 310-8512, Ibaraki, Japan

E. Kartini
Center for Technology of Nuclear Industry Materials, Indonesian National Nuclear Energy Agency Kawasan Puspiptek, Serpong 15314, Tangerang Selatan, Indonesia