Structural and Optical Properties of TIPS Pentacene Thin Film Exposed to Gamma Radiation oleh Rosfayanti Rasmidi, Mivolil D. S., Fuei Pien Chee, Floressy Juhim, Muhammad Izzuddin Rumaling, Saafie Salleh, K.A. Eswar, Khairul Anuar Mohd Salleh, Sofian Ibrahim