Abstract
The in situ 18F-γ-ray irradiation of SiO2 nanoparticles in an aqueous solution containing Ag+ led to the reduction of Ag+ to Ag0 aggregates or Ag0 nanoparticles in a small volume (0.1 ml) under air. 18F was used in the form of 18F-fluorodeoxyglucose, produced by a cyclotron at our University hospital. The in situ average absorbed dose at the distance of 1 µm in the solution volume (0.1 ml) was calculated to be 12.2 kGy equivalent to a point source of 20 MBq. The SiO2 nanoparticles had two effects; they enhanced the reduction of Ag+ to Ag0 aggregates and they acted as reaction sites to prevent aggregation. When Ag+ adsorbed on the surface of the SiO2 nanoparticles, Ag nanoparticles were formed by 18F γ-rays. The absorption spectra of Ag nanoparticles and Ag0 aggregates were markedly different.
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Miyoshi, H., Otani, T., Irikura, N. et al. In situ 18F-γ-ray-induced Ag nanoparticle formation in the presence of SiO2 nanoparticles under air. J Radioanal Nucl Chem 302, 1177–1183 (2014). https://doi.org/10.1007/s10967-014-3359-8
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DOI: https://doi.org/10.1007/s10967-014-3359-8