Nguelem, Eric J.; Fundamental Physics Laboratory, Mathematics, Applied Computer Sciences and Fundamental Physics, University of Douala, P.O. Box 24157, Douala, Cameroon > Ph.D. Student
Ndontchueng, Maurice; The National Radiation Protection Agency, P.O. Box 33732, Yaounde´, Cameroon > Ph.D.
Motapon, Ousmanou; Department of Physics, University of Douala, P.O. Box 24157, Douala, Cameroon > Professor
Darko, E. O.; Graduate School of Nuclear and Allied Sciences, P.O. Box AE1, Accra, Ghana