The Polyvinyl Alcohol (PVA) films dyed with different colors such as methylene blue (MB/PVA), methyl orange (MO/PVA), methyl red (MR/PVA) and crystal violet (CV/PVA) were investigated. The dyed PVA films were decolored by gamma radiation. So that, they were made dosimetries for high-dose control of the gamma source. We used Co60 -source in dose range of 0-150 kGy for studying decoloration of the dyed PVA films. The optical density change in these films at pre and post irradiation was studied by UV-VIS spectrophotometer. The color sensitivity on the dyed PVA films irradiated -source with difference colors was difference. The results shown that the MB/PVA films have the highest sensitivity in studied dose range.