Author(s):
1. Slavica Maletić, Univerzitet u Beogradu, Fizički fakultet, Studentski trg 12, Beograd, Serbia
2. Ivan Petronijević, Univerzitet u Beogradu, Fizički fakultet, Studentski trg 12, Beograd, Serbia
3. Dragana Cerović, University of Belgrade, Faculty of Physics, Serbia
4. Mirjana Milić, VINČA Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Department of Th, Serbia
5. Nataša Jović Orsini, VINČA Institute of Nuclear Sciences – National Institute of the Republic of Serbia, Department of Th, Serbia