Silver nanoparticles have received considerable attention due to their attractive physical and chemical properties. The surface plasmon resonance and large effective scattering cross section of individual silver nanoparticles make them ideal candidates for molecular labelling. In additional silver nanoparticles have recently been shown to be a promising antimicrobial material. Silver nanoparticles were synthesized by gamma - irradiation of aqueous silver nitrate solution with sodium citrate as reduction and stabilization agent. Silver nanoparticles and their aggregates were monitored by UV-vis spectroscopy. By varying the irradiation dose and ratio of silver salts and stabilisator concentrations, silver nanoparticles with different size and shape could be obtained.   The formation of spherical silver nanoparticles and silver nanorods were confirmed by appearance surface plasmon resonance peak at 410 nm and 660 nm. The silver nanoparticles with selective light properties as a result of SRP shifting in the UV-VIS wavelength region were produced.

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