1. Department of Radiation Biology and Radiotherapy, College of Medicine of the University of Lagos Idi-Araba. P. M. B. 12003, Lagos State, Nigeria
2. Department of Physics, Federal University of Technology, P.M.B 65, Minna, Niger State, Nigeria
3. Unité de Physique de Dispositifs à Semiconducteurs – UPDS, Faculté des Sciences de Tunis, Campus Universitaire 2092 Tunis, Tunisia