Photo degradation of commercial plastics is always a point of technical and scientific interest. Poly acrylics are important class of polymers finding applications as paints and colors. During the course applications, they have been subjected to sun light and undergo photo degradation process. Due to photo degradation, many changes like color decrease of mechanical durability occurs. Therefore study on these processes is needed. In the present studies the authors investigated photo degradation process in polyacrylamide(PAM) using electron spin resonance (ESR) spectroscopy. ESR spectra of photo degraded PAM show ill-resolved hyperfine structure at the wings; while the central part is clear. Free radicals responsible for spectra are identified. Temperature radiation dose dependent ESR spectra are recorded and spectral changes are explained. Block analysis is applied to evaluate activation energy associated with free radical decay. Radiation dose dependency of free radical formation is also studied by recording ESR spectra at different radiation doses. FTIR spectra of non-irradiated and irradiated PAM are compared. The spectra show three important groups of vibrational bands 3400 – 3000 cm-1 region corresponding to symmetric and asymmetric N – H vibrations, 1600 cm-1 band corresponding to amide carbonyl ( C = O ) band and CH2 , CH vibrations at 2900, 2800,1250,1080cm-1 positions. Due to irradiation reduction intensity of 3400-3000 cm-1 and 1620 cm-1 absorption bands is observed indicating reduction in intensity of N-H and C = O groups on irradiation