1. Department of Physics, Ahmadu Bello University, Zaria, Nigeria
2. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
3. Nuclear Engineering Programme, School of Chemical and Energy Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
4. National Atomic Energy Commission (NATEC), Sana’a, Yemen