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Photochemical reduction is used to develop many methods of creating biologically active substances and materials consisting of silver nanoclusters, which makes them relevant for science and technology, including different trends in biotechnology, catalytic systems, label-free quantification, metasurfaces and nanohybrid composites. The paper presents the silver nanoparticle (AgNP) technology based on cavitation-diffusion photochemical reduction in the presence of 10 mg of ligand (polyvinylpyrrolidone) allowing to significantly change the AgNP content depending on the concentration of silver nitrate (AgNO3) in the reaction system, and providing the AgNP domination having a certain size. It is found that at 5 mg of AgNO3 in the reaction system, the size of at least 60% of synthesized nanoparticles, is 26 nm or more, while at 2.5 mg of AgNO3, up to 94.7% of nanoparticles have the size of 15 nm and less, 6 to 10 nm AgNPs being dominated. This meets the need for AgNPs of a certain the size in different fields of science and technology, including medical and pharmaceutical industries, agriculture, and laboratory diagnostics. [ABSTRACT FROM AUTHOR]