Chemical and Physical Properties of Cassava Starch–CM-Chitosan–Acrylic Acid Gel Copolymerization by Gamma Irradiation - Rekso, Gatot Trimulyadi; Center for Application of Isotopes and Radiation, National Nuclear Energy Agency, Jl. Cinere, Pasar Jumat PO Box 7002 JKSL Jakarta 12070 (Universitas Gadjah Mada, 2014)