T Puspitasari 1National Nuclear Energy Agency, Centre for the Application of Isotopes and Radiation Technology,
P.O. BOX 7010 JKSKL, Jakarta 12070 Indonesia
CL Radiman Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences,
Institut Teknologi Bandung Jl. Ganesha No. 10, Bandung 40132 Indonesia