Y. E. Gunanto
Faculty of Education, Universitas Pelita Harapan, Karawaci, Tangerang,15811
Indonesia

W. Nursiyanto
Faculty of Informational Technic, Universitas Multi Media Nusantara, Tangerang
Indonesia

H. Tanaka
Department of Physics, Tokyo Institute of Technology Tokyo 152-8551, Japan
Japan

T. Ono
Department of Physics, Tokyo Institute of Technology Tokyo 152-8551, Japan
Japan

A. Purwanto
Centre of Technology for Nuclear Industrial Materials (PTBIN) - BATAN Kawasan Puspiptek Serpong, Tangerang, 15341
Indonesia

W. A. Adi
Centre of Technology for Nuclear Industrial Materials (PTBIN) - BATAN Kawasan Puspiptek Serpong, Tangerang, 15341
Indonesia

S. Poertadji
Faculty of Education, Universitas Pelita Harapan, Karawaci, Tangerang,15811
Indonesia