1. Physics Department, Taibah University, Al-Madinah Al-Munawara, Saudi Arabia
2. Radiation Safety Institute, Sudan Atomic Energy Commission, Sudan Academy of Science, Khartoum, Sudan
3. Department of Radiation Physics, Rabat University, Khartoum, Sudan
4. Al Imam Mohammad Ibn Saud Islamic University, Committee on Radiation and Environmental Pollution Protection, Riyadh, Saudi Arabia
5. Al Imam Mohammad Ibn Saud Islamic University, Physics Department, College of Science, Riyadh, Saudi Arabia