Y E Gunanto Faculty of Education, Universitas Pelita Harapan UPH Campus, MH Thamrin Boulevard 00-00, Lippo Karawaci 1100, Tangerang 15811
B Kurniawan Department of Physics, FMIPA-UI Kampus Baru UI, Depok 16424
A Purwanto Center of Technology for Nuclear Industrial Materials (PTBIN)-BATAN Kawasan Puspiptek, Serpong 15314, Tangerang Selatan
Wisnu Ari Adi Center of Technology for Nuclear Industrial Materials (PTBIN)-BATAN Kawasan Puspiptek, Serpong 15314, Tangerang Selatan
S Poertadji Department of Physics, FMIPA-UI Kampus Baru UI, Depok 16424