Red, Green and Blue LEDs are irradiated by Co-60 gamma radiation at the doses ranging from 1.8 kGy to 172.8 kGy. Effects of these radiation doses on the I-V and Intensity-Power characteristics of RGB LEDs are examined. I-V characteristics shows only marginal variations, however, significant reduction in output intensity is observed at the maximum dose level of 172.8 kGy. We attribute this optical intensity degradation to radiation induced decrease in the minority carrier lifetime, displacement damage and radiation induced defects