1. Radiation Research of Polymer Chemistry Department, Industrial Irradiation Division, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, Cairo, Egypt
2. Food Irradiation Research Department, Industrial Irradiation Division, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, Cairo, Egypt
3. Plant Research Department, Radioisotopes Application Division, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, Egypt