1. Department of Physics, Ferhat Abbas University, SETIF, Algeria
2. Centre de Recherche Nucléaire d’Alger, 02, Bd. Frantz Fanon, BP 399, Alger-RP, 16000 Algiers, Algeria
3. Environmental Radioactivity Laboratory – LaboRA, University of the Balearic Islands, Cra. Valldemossa Km 7.5, 07122, Palma de Mallorca, Spain