1. Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2. Department of Chemistry, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
3. Radiation Processing Technology Division, Malaysian Institute for Nuclear Technology Research (MINT), Bangi 43000 Kajang, Selangor, Malaysia