S. Sugiharto
Centre for Applicationof Isotopes and Radiation Technology, National Nuclear Energy Agency, Jl. LebakBulus Raya No 49, Jakarta 12440, Indonesia
Indonesia

R. Kurniadi
Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132, Indonesia
Indonesia

Z. Abidin
Star Energy, Wisma Barito, Jl. Let. Jen. S. Parman Kav. 62 – 63, Jakarta 11410, Indonesia
Indonesia

Z. Stegowski
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Poland

L. Furman
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. A. Mickiewicza 30, 30-059 Krakow, Poland
Poland