1. Department of Materials Science; Faculty of Science; Kasetsart University, Ladyao; Chatuchak Bangkok 10900 Thailand
2. Department of Materials Science, Center of Radiation Processing for Polymer Modification and Nanotechnology (CRPN); Faculty of Science, Kasetsart University; Bangkok 10900 Thailand
3. Thailand Institute of Nuclear Technology (Public organization); Ministry of Science and Technology; Nakornnayok 26120 Thailand