1. Radiation Safety Directorate, Partizanski Odredi 143, P.O. Box 22, 1020 Skopje, Macedonia
2. Institute of Physics, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University, P.O. Box 162, 1001 Skopje, Macedonia
3. Research Center for Computer Science and Information Technologies, Macedonian Academy of Sciences and Arts, Bul. Krste Misirkov 2, 1000 Skopje, Macedonia
4. Departamento de Fisica, Universidade Estadual de Ponta Grossa, Ave. Carlos Cavalcanti 4748, Ponta Grossa 84030-900, PR, Brazil