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Silver nanoparticles are widely studied because of their superior properties so they are widely used in various applications. Structural modification with the right synthesis method is key to obtaining superior properties of silver nanoparticles. In this experiment, gamma irradiation methods have been used to synthesize silver nanoparticles. This method has been carried out using a solution of AgNO3 metal salt with different molarities, namely 1, 10, 100 and 1000mM then for each molarity were placed in a solution of polyvinyl alcohol (PVA). The irradiation process was carried out in the cobalt-60 gamma source chamber at doses from 0 to 20kGy with a dose rate of 4.84kGy/h. This process results in a deep yellow Ag/PVA colloid nanoparticles. Increasing the molarity of the AgNO3 causes a decrease in the gamma dose applied. The properties and structure of Ag/PVA nanoparticles were characterized using UV-Vis spectrophotometer, Particle Size Analyzer and Transmission Electron Microscopy. The optical absorption spectra of Ag/PVA nanoparticles were measured using UV-Vis spectrophotometer and showed that the absorption peak was observed at wavelengths of 421-409nm. The absorption intensity increases with increasing gamma dose and reaches the maximum value at a dose of 10kGy. The resulting Ag/PVA nanoparticles have a size below 50nm. The results of the PSA and TEM analysis showed that Ag/PVA nanoparticles show increased stability because of the role of PVA in the synthesis process.