1. National Center of Energy, Sciences and Nuclear Techniques (CNESTEN); DASTE Department, Unity of Pollution and Geochemistry; Rabat; Morocco
2. Department of Physics, Faculty of Sciences; University Moulay Ismail; Meknes; Morocco
3. CEREGE; Aix-Marseille University; CNRS, IRD, CdF - BP 80; 13545; AIX en Provence Cedex 4; France